How to Test Fuel Pressure on a 2.7L Dodgeby Dan Ferrell
Chrysler has fitted some of its Dodge Intrepid, Stratus and other models with a 2.7 liter engine. The 2.7L fuel system includes a special Schrader valve on the supply line for testing purposes. Using a pressure gauge, this valve provides a way to diagnose engine performance problems related to the fuel system. Getting the pressure reading for your particular system, you can further pinpoint potential problems in the fuel pump, lines, fuel pressure regulator and other components.
Park you car outside so you have proper ventilation during the test.
Detach the injector cover from the top of the engine, if your particular Dodge model comes equipped with it. Use a ratchet and socket.
Locate the supply line and Schrader valve on your vehicle. This is the line the fuel injectors connect to. The Schrader valve is located on the end of the supply line. The valve looks like the air valve on the tires of your vehicle. You might need to unscrew a plastic cap from the valve.
Wrap a shop rag around the Schrader valve as you thread a fuel pressure gauge to the valve. Use the shop rag to catch any fuel squirting out of the valve as you connect the gauge.
Insert the end of the bleeding hose of the fuel pressure gauge into a 12-ounce container and open the gauge valve to bleed the air out of the gauge.
Connect a scan tool into the data link connector underneath the dashboard, on the driver's side.
Ask your assistant to turn the ignition switch "On," but do not start the engine. Have your assistant activate the fuel pump with the scan tool, following the instructions of the tool manufacturer.
Close the gauge valve as soon as you see gasoline flowing into the container through the bleeding hose and read the fuel pressure indicated on the gauge. On a 2000 Dodge Intrepid with a 2.7L V6, the gauge should indicate 58 PSI. Compare your reading to the one indicated in the service manual for your particular Dodge model.
Ask your assistant to turn off the scan tool, then turn off the ignition switch.
Remove the fuel pressure gauge from the fuel supply line. Replace the injector cover, if your particular Dodge model comes equipped with it, using the ratchet and socket. Close the hood.
- "Chrysler LH-series Automotive Repair Manual;" Eric Godfrey and John Harold Haynes; 2008
- "The Haynes Fuel Injection Diagnostic Manual;" Mike Stubblefield and John H. Haynes; 2000
Things You'll Need
- Ratchet, if necessary
- Socket, if necessary
- Shop rag
- Fuel pressure gauge
- 12 ounces container
- Scan tool
- When servicing the fuel system, always park your vehicle away from appliances with open flames such as dryers and water heaters. This will prevent highly flammable gasoline vapors from igniting and causing an accident.
Since 2003 Dan Ferrell has contributed general and consumer-oriented news to television and the Web. His work has appeared in Texas, New Mexico and Miami and on various websites. Ferrell is a certified automation and control technician from the Advanced Technology Center in El Paso, Texas.