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Home >> GMC >> 1992 >> Forward Control 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Controls - Basic Testing - 3.0L) >> Fuel System >> Fuel Pressure >> Fuel Pressure Release

Fuel Pressure Release

WARNING: This page is about a different car, the 1995 Plymouth Voyager, 1995 Plymouth Grand Voyager, 1995 Dodge Grand Caravan, and 1995 Dodge Caravan. However, it is still accessible from the selected car via links, so may be relevant.
  1. Fuel pressure must be fully released before opening fuel system or removing any fuel-carrying components. To release pressure in tank, open fuel tank cap slowly.
  2. To release remaining pressure in system, disconnect injector wiring harness. Connect a jumper wire between fuel rail harness connector A142 circuit terminal (Dark Green/Orange wire) and battery voltage. Ground one end of another jumper wire and use it to momentarily ground one injector. Repeat this procedure for 2 or 3 injectors or until no pressure exists.
WARNING: Before disconnecting any fuel line, or fuel system component during testing, repeat FUEL PRESSURE RELEASE procedure. Perform FUEL PUMP TEST with fuel tank at least half full.
NOTE: Vacuum supply line at fuel pressure regulator must be disconnected to obtain accurate pressure readings.
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