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HOMESERVICE MANUALSFORD1992CROWN VICTORIA TOURING, AOD-EREPAIR AND DIAGNOSISENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IVFUEL SYSTEMFUEL DELIVERYFUEL PUMP TESTING
1992 Ford Crown Victoria Touring, AOD-E

Fuel Pump Testing

1992 Ford Crown Victoria Touring, AOD-ESECTION Fuel Pump Testing
  1. Visually inspect fuel delivery system for leaks and damaged lines. Ensure battery is fully charged and fuses are okay. Check fuel tank contents and fuel gauge accuracy.
  2. Release fuel pressure. See FUEL SYSTEM PRESSURE RELEASE  . Install fuel pressure gauge. Turn ignition on to activate pump. Check and record fuel pressure. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article. Proceed to appropriate step as indicated:
    • If fuel pressure is within specification, go to step 3).
    • If fuel pressure is zero, go to step 5).
    • If fuel pressure is low, go to step 6).
    • If fuel pressure is high, go to FUEL PRESSURE REGULATOR.
      CAUTION: Inspect fuel system for leaks and damage before testing fuel pump.
  3. Check fuel injectors. See FUEL CONTROL  . Start or crank engine. Using a mechanic's stethoscope, listen for regularly spaced operating clicks at each injector. If clicks are present, check fuel injectors for flow and leakage.
  4. If clicks are not present, check fuel injector resistance. See FUEL CONTROL  . Replace injectors not within specification. If injectors are within specification, check for 12 volts at each injector lead. If voltage is present, circuit is okay. Clean or replace injectors as necessary. If voltage is not present at injectors, see CIRCUIT TEST H in TESTS W/CODES - EEC-IV article in the ENGINE PERFORMANCE section for circuit diagnosis.
  5. If fuel pressure is zero, ensure battery is fully charged. Ensure connection is okay at pump/sending unit. Turn ignition off. Using a jumper lead, ground FP terminal at self-test connector. See Fig 1 . Turn ignition on, leaving engine off. Listen for sound of fuel pump. If pump is running, go to next step. If pump is not running, go to step 7).
    Fig 1: Fuel Pump Connector Terminal & Circuit ID
    G91E11233
  6. Check condition of fuel filter. Replace filter if necessary, and repeat step 1). If filter is okay, check fuel pressure regulator. See FUEL PRESSURE REGULATOR.
  7. Turn ignition off. Disconnect fuel pump/sending unit connector. Measure resistance between pump ground at connector and chassis ground. If resistance is greater than one ohm, repair open circuit to ground. If resistance is not greater than one ohm, go to next step.
  8. Ensure ignition is off and battery is fully charged. Disconnect harness connector from pump/sending unit. Ground FP terminal at self-test connector. Turn ignition on. Measure voltage at pump power terminal of pump/sending unit connector. If voltage is greater than 10.5 volts, replace pump/sending unit assembly. If voltage is not greater than 10.5 volts, go to next step.
  9. Check inertia switch. See ENGINE SENSORS & SWITCHES (ECA INPUTS). Check fuel pump relay (if equipped). See RELAYS under MODULES, RELAYS & SOLENOIDS. Check integrated relay control module (if equipped). See MODULES under MODULES, RELAYS & SOLENOIDS. Check engine compartment for leaks and ensure engine produces normal engine vacuum. See FUEL PRESSURE REGULATOR.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.