How to Check for Fuel Delivery in Cars

by Contributing Writer

The model's fuel delivery is electronic throttle-controlled sequential multi-port fuel injection. High flow injectors are an available option, used primarily with engine upgrades compatible with the use of nitrous. Signs of impaired fuel delivery include low power, hard starting and engine stalling while driving.

Under The Hood:

 How to Check for Fuel Delivery in a Dodge Caravan

Disconnect the negative battery cable in Dodge Caravan vehicles produced in 2000 with 2.4L, 3.3L and 3.8L engines. Remove the cap from the pressure test port, located on the fuel rail. Put the open end of the fuel pressure release hose tool C-4799-1 into a container approved for fuel and put a shop towel under the port. Connect the other end of the hose to the pressure test port. Release the pressure, remove the hose and then replace the cap.

Relieve fuel system pressure in Dodge Caravan vehicles produced in 2000 and after. Disconnect the fuel pump relay from the power distribution center. Start the car and let the engine run until it stalls. Try to start it again and don't continue until the engine no longer runs at all. Turn the ignition switch to the "off" position.

Continue relieving the fuel delivery for a 3.0L engine produced in 2000. Disconnect the fuel injectors and attach one end of a jumper wire to an injector terminal located at the fuel injector harness connector. Attach the other end of the wire to the positive battery terminal. Secure one end of a second jumper wire to the remaining free injector terminal. Quickly touch the free end of the second jumper wire to the negative battery terminal.

Remove the vacuum line from the fuel pump pressure regulator and check for fuel. Refer to the owner's manual for the line's location. There shouldn't be any fuel in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines rather than into the engine. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.

Reconnect the battery and twist off the fuel pressure test port cap and attach a fuel pressure test gauge. Turn the engine on and let it idle. Check the gauge. It needs to read between 44 and 54 pounds per square inch. Pressure that's too high or too low may mean the fuel pump is malfunctioning or that the fuel filter is clogged. Remove the pressure gauge.

Disconnect the negative battery cable again and relieve fuel system pressure again so you can remove the fuel filter to check for clogs.

Raise up the Dodge Caravan and use a transmission jack to support the fuel tank. Remove the fuel line, located at the front of the tank. Remove the ground strap, the straps at the inboard side of the tank and the front T-strap fastener. Lower the fuel tank approximately six inches and disconnect the fuel pump module from the remaining fuel lines. Remove the fuel filter and visually inspect it for clogs. Reinstall it if it's in good working condition. Replace it if it's clogged, or it's been more than one year or 47,000 miles since it was last replaced.

Install or reinstall the fuel filter by reversing the removal process listed in Step 5. Tighten the filter bolts to 40 inch pounds (4.5 Nm). Secure the tank straps to 40 foot pounds (54 Nm). Tighten the T-strap to 250 inch pounds (28 Nm). Start the engine and visually inspect the Caravan's fuel filter for leaks.

 How to Check for Fuel Delivery in a Dodge Ram

Relieve fuel system pressure in Dodge Ram vehicles for model years 2003 and later. Disconnect the negative battery cable and the fuel pump relay from the power distribution center. Remove the fuel tank filler cap and disconnect the fuel injectors. Start the Ram and let it idle until it runs out of fuel and stalls. Attach one end of a jumper wire to an injector terminal and attach the other end of the wire to the positive battery terminal. Attach one end of a second jumper wire to the remaining injector terminal. Touch the free end of the second jumper wire to a ground for two to three seconds. Put a shop towel under the quick-disconnect coupling located on the fuel rail and disconnect it.

Disconnect the negative battery cable and remove the fuel tank filler cap as the first steps to relieve fuel system pressure in pre-2002 Ram models. Then, unscrew the pressure test port cap on the fuel rail at the front of the engine. Use a pressure gauge or hose from tool set No. 5069 or equivalent. Remove the gauge and put that end of the hose into a container approved for fuel. Put a shop towel beneath the test port and attach the free end of the gauge or hose onto the fuel pressure port. Relieve the pressure. Remove the hose and cap the port.

Remove the vacuum line from the fuel pump pressure regulator and check for fuel in the lines. Refer to the owner's manual for the line's location. There shouldn't be any fuel in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.

Reconnect the battery and twist off the fuel pressure test port cap. Attach a fuel pressure test gauge. Turn the engine on and let it idle. Check the gauge. It needs to read between 17 and 22 psi (117 to 152 kPa). Pressure that's too high or too low may mean the fuel pump is malfunctioning or that the fuel filter is clogged.

Remove the pressure gauge. Disconnect the negative battery cable again and relieve the system pressure one more time to safely remove the fuel filter and inspect for clogs. To remove the fuel filter on Ram trucks, disconnect the fuel tank and take the filter or regulator out of the rubber grommet. Cut the hose clamp and remove the fuel line. Remove the filter and visually inspect it for clogs.

Replace the fuel filter if necessary. To install or reinstall the filter, secure the unit with a new clamp and push the unit into the rubber grommet. Reconnect the fuel tank and the negative battery cable. Start the Dodge Ram and visually inspect the system for fuel leakage.

 How to Check for Fuel Delivery in an Acura Integra

Release pressure from the fuel system carefully. Loosen the banjo bolt on the top of the Acura Integra model's fuel filter. Disconnect the battery and remove the fuel fill cap. Use a box wrench to hold the bolt while you hold the fuel filter with a second wrench. Loosen the bolt one full counter-clockwise turn to release any engine pressure.

Wait as any pressure is released from the fuel system and then remove the banjo bolt. Screw a fuel pressure adapter bolt into the banjo bolt hole. The fuel pressure reading is given at the gauge on the top of the bolt.

Reconnect the battery and disconnect the vacuum hose from the fuel pressure regulator. Pinch the vacuum hose. If necessary, refer to the owner's manual for a diagram of the fuel system lines and hoses to help locate the vacuum hose.

Start the engine and let it idle as you check the fuel pressure reading. Pressure needs to be between 270 and 320 kPa (2.8 to 3.3 kgf/cm2, 40 to 47 psi) for a B18B1 engine, or between 320 and 370 kPa (3.3 to 3.8 kgf/cm2, 47 to 54 psi) for B18C1 and B18C5 engines.

Cut the engine. Reconnect the vacuum hose to the fuel pressure regulator.

Start the engine, let it idle and check the fuel pressure again. Pressure now needs to read between 250 and 290 kPa (2.5 to 3.0 kgf/cm2, 36 to 43 psi) for a B18B1 engine, or between 260 and 310 kPa (2.7 to 3.2 kgf/cm2, 38 to 46 psi) for B18C1 and B18C5 engines.

Determine whether the fuel pressure meets the above requirements for both checks. If it does, the fuel delivery is optimal. If fuel pressure is too high, the system is delivering too much fuel to the engine. Check the fuel return hose and lines visually for pinches or clogs. If there are none, the likely cause of the high pressure is a malfunctioning fuel pressure regulator. If fuel pressure is too low, the system is not delivering enough fuel to the engine, which may be caused by a clogged fuel filter.

Inspect the fuel lines for leaks by looking them over carefully for any signs of moisture. If moisture is present on a line, that line is leaking and must be replaced.

Inspect the fuel filter for clogs. Get two wrenches to fit the sizes of the fuel filter fittings. Grip the fittings with the wrenches and then drape a rag or shop cloth over the fittings and wrenches to catch any pressurized fuel that might still be lurking in the lines. Hold the wrench gripping the actual filter and turn the other counter clockwise until the bolt comes out. Remove the fuel line, set the bolt and washers in a safe place, and repeat this step for the other side of the fuel filter.

Use a flat head screw driver to remove the clamp holding the fuel filter in place. Remove the fuel filter from the Integra carefully as fuel is still present inside the filter.

Inspect the fuel filter visually for clogs and refit the Integra with a new filter if necessary. Simply reverse the filter removal process to reinstall the old or install a new filter. If the lines and filter are in working order any fuel delivery problem is likely caused by a faulty fuel pressure regulator.

Items you will need

  • Box wrench

 How to Check Fuel Delivery in a Jeep Grand Cherokee

Release fuel system pressure in Jeep Grand Cherokee vehicles produced after 2003. Disconnect the fuel pump relay from the power distribution center. Start the vehicle and let it run until it stalls. Try to start it again until the engine no longer runs. Turn the vehicle off and disconnect the fuel injectors.

Attach one end of a jumper wire to an injector and the other to the positive battery terminal. Secure one end of a second jumper wire to the remaining free injector terminal. Touch the free end of the second jumper wire to the negative battery terminal for about three seconds. Disconnect the fuel rail coupling.

Disconnect the vacuum line from the fuel pump pressure regulator and check for fuel. There shouldn't be any fuel in the line. If there is, the engine problems are caused by a faulty fuel pump pressure regulator. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.

Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Disconnect the vacuum hose again and check the gauge. It needs to read between 44 and 54 pounds per square inch. High pressure readings indicate that the pressure regulator is malfunctioning. Low pressure readings indicate that the fuel filter is clogged or that the fuel pump needs to be replaced.

Remove the fuel filter to check for clogs on 2004 and earlier Grand Cherokee model years. Cut the engine, relieve system pressure and remove the negative battery cable again so its safe to remove the filter. Jeep Grand Cherokee models made in 2005 and later do not use a separate fuel filter.

Detach the fuel pressure, fuel return and supply lines from the filter. Undo the filter bolts and remove the filter.

Examine the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is due to a faulty fuel pump.

 How to Check for Fuel Delivery in a Cadillac Escalade

Ask a friend to help you check the fuel delivery in the Cadillac Escalade.

Ask the helper to remove the gas cap and open the gas tank while you turn the ignition key far enough for the dash lights to turn on. Do not start the engine.

Position your helper to listen to the gas tank. Turn the key in the ignition to start the engine and run the fuel pump for two seconds. Shut off the engine. If it does not run, the fuel delivery is compromised by either a faulty fuel pump, pump regulator or fuel pump relay.

Check the Escalade SUV's fuel pressure. Open the hood of the Escalade and remove the cap from the shredder valve located on top of the engine. Attach a fuel pressure gauge to test the pressure. The gauge needs to read 40 to 45 psi when the engine is off. If the pressure is too high the likely causes are a faulty pressure regulator or clogged fuel return line. If pressure is too low the likely causes are a clogged fuel filter, a faulty pressure regulator, a clogged fuel supply line or a malfunctioning fuel pump.

Relieve fuel pressure inside the engine. Start the engine and remove the fuel pump relay while the engine is running. Any pressurized fuel in the lines is used and the engine quickly dies, allowing removal of the fuel filter without danger.

Inspect the fuel lines for leaks by looking them over carefully for any signs of moisture. If moisture is present on a line, that line is leaking and must be replaced.

Inspect the fuel filter for clogs. Get two wrenches the size of the fuel filter fittings. There are two fittings that differ in size. Grip the fittings with the wrenches and then drape a rag or shop cloth over the fittings and wrenches to catch any pressurized fuel that might still be lurking in the lines. Hold the wrench gripping the actual filter and turn the other counter clockwise until the bolt comes out. Remove the fuel line, set the bolt and washers in a safe place, and repeat this step for the other side of the fuel filter.

Use a flat head screw driver to remove the clamp holding the fuel filter in place. Remove the fuel filter carefully as fuel is still present inside it.

Inspect the fuel filter visually for clogs and refit the Escalade with a new filter if necessary. Simply reverse the filter removal process to reinstall the old or install a new filter. If the lines and filter are in working order and the engine is still faltering, the cause is either a faulty fuel pressure regulator or faulty fuel pump and you should consult a professional for further diagnosis.

Items you will need

  • Flat head screwdriver

  • Wrenches of varying size

 How to Check for Fuel Delivery in a Nissan Altima

Relieve the pressure in the Nissan Altima model's fuel system. Disengage the fuel pump fuse. Start the engine and let it run until it stalls. Turn the ignition to the off position and disconnect the negative battery cable.

Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is probably due to a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Twist off the fuel pressure test port cap and use a "T" connector to attach a pressure gauge to the fuel pressure valve. Open the manual valve on the gauge and let the fuel drain through the connected tube into an approved container. Reconnect the negative battery cable and start the engine.

Check the pressure gauge. It needs to register approximately 34 psi. Pressure that's too high indicates a malfunctioning pressure regulator. Low pressure indicates a clogged fuel filter or a broken fuel pump that needs to be replaced.

Cut the engine, relieve system pressure again and remove the negative battery cable.

Remove the filter and the fuel pump combo assembly. Disconnect the electrical connector to the pump located under the back seat. Disengage the fuel lines that run to the pump. Disengage the locking ring and assembly for the fuel gauge. Disconnect the fuel gauge from its tube and connector. Lift the pump straight up out of the fuel tank by pressing the two locking tabs together to release the holding bracket.

Examine the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably caused by a faulty fuel pump.

 How to Check for Fuel Delivery in a Ford Focus

Check the fuel delivery system of the Ford Focus if the engine is running rough, hesitating, stalling out while driving or not starting at all.

Release fuel system pressure. Remove the fuse for the fuel pump from the battery junction box. Start the engine and let it run until it stalls and quits. Crank the engine for five seconds to release the pressure. Disconnect the negative battery cable.

Disconnect the vacuum line from the fuel pump pressure regulator and check for fuel in the line. Refer to the owner's manual for the line's location if you aren't sure which one it is. If there is fuel present in the line, the engine problems are likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the lines, reattach the vacuum line and continue with the Ford Focus fuel delivery diagnostic.

Twist off the fuel pressure test port cap and attach a fuel pressure test gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Let it idle and then check the pressure gauge. It needs to read between 35 and 60 pounds per square inch. Pressure that's too high is an indicator that the pressure regulator is malfunctioning. Pressure that's too low indicates that the fuel filter is clogged or that the fuel pump is malfunctioning and needs to be replaced.

Cut the engine. Relieve system pressure again and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs. Raise the Focus up and access the fuel assembly. Removing the evaporative emissions (EVAP) vapor line, the fuel filter lines, the fuel filter bracket assembly and finally the fuel filter. Visually check the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is likely caused by a faulty fuel pump.

Install or reinstall the filter. Install the fuel filter into its bracket assembly. Connect the fuel filter lines and the EVAP vapor line. Lower the Focus and reconnect the negative battery cable. Start the engine and visually check for any leaking fuel.

 How to Check for Fuel Delivery in a Ford Explorer

Check the fuel delivery system in the Ford Explorer if the engine is running rough, hesitating, stalling out while driving or not starting at all.

Relieve fuel system pressure. Disconnect the negative battery cable and remove the door frame scuff plate from the front passenger door frame, which includes removing the internal metal retaining clips. Disconnect the Inertia Fuel Shutoff (IFS) switch electrical connector and start the Explorer. Let it run until it stalls out. Crank the engine for at least five seconds after it stalls to relieve all system pressure. Turn the ignition off.

Disconnect the fuel pressure sensor vacuum hose and check for fuel in the line. Refer to the owner's manual for the line's location if you aren't sure which one it is. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator, which means there is not enough fuel in the engine for proper function. If there is no fuel in the lines, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Remove the cap from the fuel pressure relief valve and attach a fuel pressure test gauge. Reconnect the negative battery cable and turn the ignition key to the first position. Do not start the engine. Check the pressure gauge. It needs to read between 39 and 42 pounds per square inch. Pressure that's too high is another indicator that the pressure regulator is malfunctioning. Pressure that's too low indicates that the fuel filter is clogged or that the fuel pump needs to be replaced.

Turn the ignition off, remove the pressure gauge and the negative battery cable again so you can safely remove the fuel filter to check for clogs. Raise the Ford Explorer, unscrew the bolts from the fuel filter heat shield and remove the shield. Remove the nuts and then the fuel filter shield.

Disengage the quick release and spring lock couplings and extract the fuel filter. Visually check the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably caused by a faulty fuel pump. Install or reinstall the fuel filter by reversing the removal steps from Steps 5 and 6. Tighten the bolts on the fuel filter heat shield to 15 foot pounds (20 Nm.)

Lower the Explorer, reconnect the negative battery cable and start the engine. Visually check for any leaking fuel.

 How to Check for Fuel Delivery in a Chrysler Sebring

Check the Chrysler Sebring fuel delivery if the engine does not start immediately, if it stalls or exhibits low power.

Relieve fuel system pressure. Disconnect the fuel pump relay from the power distribution center. Start the car and let the engine run until it stalls. Try to start it again and don't continue until the engine doesn't run at all. Turn the ignition switch to the "off" position.

Remove the vacuum line from the fuel pump pressure regulator and check for fuel. Refer to the owner's manual for the line's location. There shouldn't be any fuel in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines rather than into the engine. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.

Reconnect the battery and twist off the fuel pressure test port cap. Attach a fuel pressure test gauge to the fuel pressure valve. Turn the engine on and let it idle.

Check the gauge. It needs to read between 55 and 62 psi. Pressure that's too high or too low may mean the fuel pump is malfunctioning or that the fuel filter is clogged.

Remove the pressure gauge. Disconnect the negative battery cable again and relieve fuel system pressure so you can remove the fuel filter to check for clogs.

Disconnect the fuel pump module and unlock the fuel pump locking tabs. Remove the strainer and o-ring. Remove the inlet fuel filter from the fuel assembly. On Sebring 2001 through 2005 models the fuel filter is integrated with the fuel pump inside the fuel tank. To access the filter, drain the fuel tank into an approved container.

Visually inspect the filter for clogs. Reinstall it if it's in good working condition by reversing the above removal process. Replace the filter if it's clogged, or if it's been more than one year or 47,000 miles since it was last replaced.

 How to Check for Fuel Delivery in a Chevy Cobalt

Open the hood of the Chevy Cobalt when the engine is cool.

Locate the fuel pressure test port on the Cobalt engine fuel line. If you need help finding it, refer to the owner's manual for a diagram of the engine.

Remove the cap from the test port and attach a standard fuel pressure gauge. Screw the connector on tightly so you get a true reading.

Hold the gauge so you can see the dial. Ask a helper to turn the ignition key to the first position. Do not start the car. Watch the gauge needle settle. Record this as the first pressure reading.

Remove the vacuum line from the fuel pump pressure regulator and check for fuel. Refer to the owner's manual for the line's location. No fuel should be present in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator, which means the fuel is not adequately pressurized when being sent to the injectors, so there isn't enough fuel in the engine for it to run properly. If there is no fuel, reattach the vacuum line and continue with the fuel delivery diagnostic.

Start the engine and let it idle while you remove the vacuum line again. Watch the pressure gauge. It needs to register between five and ten pounds psi. If the needle does not move, the pressure regulator is malfunctioning and needs to be replaced.

Leave the engine on and watch the pressure gauge as a helper works the throttle. The gauge needs to register approximately five psi. If it moves down, the fuel pump is malfunctioning and needs to be replaced. Another option is that the fuel filter is clogged and needs to be replaced.

Start the engine and remove the fuel pump relay while the engine is running to relieve fuel pressure inside the engine. Any pressurized fuel in the lines is used and the engine quickly dies, allowing removal of the fuel filter without danger. Turn the engine off.

Inspect the fuel filter for clogs. Use two wrenches the size of the fuel filter fittings. There are two fittings that differ in size. Grip the fittings with the wrenches and then drape a rag or shop cloth over the fittings and wrenches to catch any pressurized fuel that might still be lurking in the lines. Hold the wrench gripping the actual filter and turn the other counter clockwise until the bolt comes out. Remove the fuel line, set the bolt and washers in a safe place, and repeat this step for the other side of the fuel filter.

Use a flat head screw driver to remove the clamp holding the fuel filter in place. Remove the fuel filter from the Cobalt carefully as fuel is still present inside the filter.

Inspect the fuel filter visually for clogs and refit the Chevy Cobalt with a new filter if necessary. Simply reverse the filter removal process to reinstall the old or install a new filter. If the filter is in working order the cause of the fuel delivery problem is a faulty fuel pump.

Remove the fuel pressure gauge and replace the test port cap.

Items you will need

  • Wrenches of varying size

  • Flathead screwdriver

 How to Check for Fuel Delivery in a Chevy Silverado

Release the Chevy Silverado's fuel delivery system's pressure. Disconnect the negative battery cable and loosen the fuel fill cap. Drape a towel over the fuel pressure Schrader valve fitting to protect from any pressurized fuel spray.

Disconnect the vacuum line from the fuel pump pressure regulator and check for fuel. Refer to the owner's manual for the line's location if you aren't sure which one it is. There shouldn't be any fuel present in the line. If there is, the engine problems are likely caused by a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines instead of into the engine and there is not enough fuel in the engine for proper function. If there is no fuel in the lines, reattach the vacuum line and continue with the fuel delivery diagnostic.

Reconnect the battery and twist off the fuel pressure test port cap. Attach a fuel pressure test gauge to the fuel pressure valve. Turn the engine on and let it idle. Check the gauge. It needs to read between 55 and 62 psi. Pressure that's too high or too low may mean the fuel pump is malfunctioning or the fuel filter is clogged.

Remove the pressure gauge. Disconnect the negative battery cable again.

Drain fuel from the fuel filter. Attach one end of a hose to the water drain on the water-in-fuel sensor. Place other end of the hose into a container approved for holding fuel. Disconnect the water-in-fuel sensor harness connector and then disconnect the fuel filter from the fuel filter and heater element housing. Disconnect the water-in-fuel sensor from the fuel filter.

Remove the fuel filter and visually check it for clogs. Reinstall the fuel filter if it is in good working order. Replace the filter if it is clogged, if it's been more than one year or more than 15,000 miles since the filter was replaced.

Clean the fuel filter and heater element housing. Check the filter for a possible problem filter seal. Coat an intact seal with clean engine oil. Connect the water-in-fuel sensor. Install the filter onto the fuel filter and heater element housing. Connect the water-in-fuel harness connector and negative battery cable.

Prime the fuel system after reinstalling or replacing the fuel filter. Pump the primer on top of the filter 30 times or until it's stiff. Start the engine and let it idle for five minutes. Visually check for any leaking fuel.

 How to Check for Fuel Delivery in a Kia Spectra

Relieve fuel system pressure. Take off the fuel pump cover located under the back seat cushion. Disconnect the electrical connection. Start the Kia Spectra and let the engine run until it stalls from lack of gasoline. Turn off the ignition, reconnect the pump's electrical connection and disconnect the negative battery cable.

Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is probably due to a faulty fuel pump pressure regulator, which means there is not enough fuel in the engine for proper function. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Disconnect the vacuum hose again and check the gauge. It needs to read between 48 and 51 pounds per square inch. High pressure readings indicate that the pressure regulator is malfunctioning. Low pressure reading indicate that the fuel filter is clogged or that the fuel pump needs to be replaced.

Cut the engine. Relieve system pressure and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs.

Remove the fuel lines from either side of the filter. Loosen the filter fittings and the mounting bracket. Take out the fuel filter.

Inspect the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is probably because of a faulty fuel pump.

 How to Check for Fuel Delivery in a Hyundai Sonata

Check fuel delivery in the Hyundai Sonata if the engine runs rough, stalls in traffic or doesn't start at all.

Relieve fuel system pressure. Take the back seat cushion out and remove the access panel underneath to disconnect the connector for the fuel pump module. Start the Hyundai Sonata and let the engine run until it stalls from lack of gasoline. Turn the ignition off and disconnect the negative battery cable.

Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely caused by a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Twist off the fuel pressure test port cap and secure a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable and start the engine. Disconnect the vacuum hose again and check the gauge. It needs to read between 38 and 50 pounds per square inch. High pressures indicate that the pressure regulator is malfunctioning. Low pressures indicate that the fuel filter is clogged or that the fuel pump needs to be replaced.

Cut the engine. Relieve system pressure and remove the negative battery cable again so you can safely remove the fuel filter to check for clogs.

Loosen the filter fittings and unhook the pressure and fuel lines from the filter. Undo the bracket on the fuel filter and take it out.

Inspect the filter for clogs and replace it with a new one if necessary. If there are no clogs, the fuel delivery problem is due to a faulty fuel pump.

 How to Check for Fuel Delivery in a Mitsubishi Galant

Relieve fuel system pressure in four-wheel drive Galant models by loosening the gas cap and undoing the harness connector to the fuel pump. Raise the Mitsubishi Galant if necessary. In all-wheel drive Galant models, disengage the wiring that connects the fuel tank and the fuel pump cover. Start the vehicle and let the engine run until it stalls. Turn the ignition off and disconnect the negative battery cable.

Disconnect the fuel pressure sensor vacuum hose. Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely due to a faulty fuel pump pressure regulator. If there is no fuel in the line, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Twist off the fuel pressure test port cap and attach a pressure gauge to the fuel pressure valve. Reconnect the negative battery cable, start the engine and let it idle. Check the gauge. It needs to register approximately 27 psi. Disconnect the vacuum hose and check the gauge again. It needs to read between 36 and 38 psi. Pressure that's too high indicates a malfunctioning pressure regulator. A low pressure indicates a broken fuel pump that needs to be replaced.

Cut the engine, relieve system pressure again and remove the negative battery cable.

Remove the fuel filter. Undo the retaining cap on the fuel pump with tool MB991480. Disconnect all wiring and hoses to the fuel pump, which is accessible by lifting the back seat. Remove the fuel pump and filter.

Examine the filter for clogs and replace if necessary. If there are no clogs, the fuel delivery problem is probably caused by a breakdown in the fuel pump itself.

 How to Check for Fuel Delivery in a Geo Metro

Remove the control relay box cover and disconnect the fuel pump relay from the relay box connector to relieve fuel system pressure. Take out the circuit opening relay located over the left, lower kick panel. Start the Metro and let it run until it stalls and quits. Crank the engine for at least three seconds to relieve any remaining pressure.

Disconnect the negative battery cable and the fuel pressure sensor vacuum hose. Refer to the owner's manual for the line's location if you aren't sure which one it is.

Check for fuel in the line. If there is fuel present in the line, the fuel delivery problem is likely a faulty fuel pump pressure regulator, which means the fuel is flowing back into the lines instead of into the engine and there is not enough fuel in the engine for proper function. If there is no fuel in the lines, reattach the vacuum hose and continue with the fuel delivery diagnostic.

Reconnect the negative battery cable, start the engine and let it idle. Check the pressure gauge. The gauge needs to read 25 to 33 pounds per square inch. Pressure that's too high indicates a malfunctioning pressure regulator. Pressure that's too low indicates a clogged fuel filter or fuel pump that needs to be replaced.

Cut the engine and remove the pressure gauge. The fuel filter in the Geo Metro is integrated into the fuel sender assembly located in the fuel tank. The Metro fuel filter is not detachable to examine for clogs.