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How to Check the Fuel Pressure PSI on a 1989 Ford F-150

The fuel system pressure in a 1989 Ford F-150 should be between 55-62 psi while the fuel pump is operating. Problems will occur when the fuel pressure falls outside of this range. Fuel pressure below 55 psi can cause sluggishness, engine stalling and poor performance. Fuel pressure above 62 psi can decrease fuel economy and increase exhaust emissions. You must use a fuel pressure gauge to obtain an accurate fuel pressure reading.

This process does not require tools.

Check the Fuel Pressure PSI

Place the carin park and apply the parking brake. Turn off the engine and open the hood.

Locate the Schrader valve on the front side of the fuel rail. Unscrew the Schrader valve cap.

Attach the fuel pressure gauge to the Schrader valve and place the gauge in a position where it is readable from inside the vehicle.

Turn the ignition to the "ON" position. Do not start the vehicle. The fuel pump should cycle on for two to three seconds.

Note the reading on the pressure gauge.

Turn the ignition to the "OFF" position and immediately back to the "ON" position to cycle the fuel pump on again. Note the reading on the pressure gauge.

Repeat Step 6 as necessary to obtain an accurate reading.

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