How to Test the Fuel Pressure on an Oldsmobile

by Leanne Clute
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Checking the fuel pressure in an Oldsmobile is part of the routine maintenance of a vehicle. If the pressure is too high it can cause poor gas mileage and black exhaust smoke, while if it is to low the engine may misfire. The fuel pump and pressure system work together to keep a car's engine running smooth. A check engine light, poor gas mileage and smoke are all indicators that you may need to test the fuel pressure.

Step 1

Consult the Oldsmobile car manual specific to the model of your vehicle to find the location of the fuel pressure test port. These often come with the vehicle when purchased, but if it is missing, one can be ordered directly from GM, the manufacturer of Oldsmobile.

Step 2

Attach the nozzle end of the fuel pressure gauge to the test port. If it does not fit properly you may need an adapter manufactured specifically for GM automobiles. It may be necessary to have one person hold the gauge while another runs the vehicle.

Step 3

Turn the ignition key to the "Accessory" setting and write down the gauge readings. This will be the starting reference number. The Oldsmobile car manual will have specifications listed for fuel pressure in the section of the manual that discusses fuel pressure tests.

Step 4

Start the vehicle and allow it to run for five minutes. Record the pressure ratings again. Compare both readings to the specifications listed in the owners manual. If there is a large difference, the vehicle will need to be inspected for fuel filter or fuel pump repairs.

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