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Home >> Oldsmobile >> 1990 >> Cutlass Calais Base, 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L/151"" TBI In-Line 4 VIN [U] >> Fuel System >> Fuel Pump Output Check >> Fuel Pump Pressure Check

Fuel Pump Pressure Check

  1. Relieve fuel system pressure:
    • Loosen the fuel filler cap to relieve the tank vapor pressure.
    • Remove "Fuel Pump" fuse from fuse block in passenger compartment.
    • Crank engine. Engine will start and run until fuel remaining in fuel lines is consumed. Crank the starter for three seconds to assure that any remaining pressure is relieved.
    • With the ignition OFF, replace the "Fuel Pump" fuse.
  2. Disconnect flexible fuel feed hose in engine compartment. Install J-29658-B or BT-8205 gauge using J-29658-85 adapter between steel line and flexible hose of the fuel feed line. See Figure for fuel line identification. See Figure for gauge assembly illustration.
  3. Tighten the gauge connections to ensure that no leaks occur during testing. Start the engine observe the fuel pressure reading, verifying that it is within specifications. See FUEL PUMP PRESSURE/VOLUME SPECIFICATIONS TABLE.
  4. If pressure is outside specification, refer to Chart A-7 to diagnose. (The A-charts are not contained in this article. They can be found in the appropriate article in ENGINE PERFORMANCE section.)
  5. Depressurize the fuel system (refer to step 1 above) and remove the fuel gauge. Reinstall steel fuel line from filter to throttle body and torque to 27 N.m (20 lb.ft.). Install new "O" ring on fuel feed line. Start the engine and check for fuel leaks.
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