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Fuel Pump Relay Diagnostic/Troubleshooting Notes:

Airtex E3500M Fuel Pump Module Assembly

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Electric Fuel Pump Relay Wiring Diagram

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Mazda 626 - Fuel Pump Relay Diagnostics

  1. FP relay terminal A (ORG wire):
  2. Should have 10 to 12 Volts DC with Key On Engine Cranking or Key On Engine Running (KOER).
  3. This voltage comes from the GRY inline fusible link located in the engine compartment junction block.
  4. FP relay terminal E (GRY wire):
  5. Should have 10 to 12 Volts DC when the engine is being cranked and relay has activated.
  6. FP relay terminal D (BLK/WHT wire):
  7. Should have ground all of the time.
  8. FP relay terminal F (DK GRN/WHT wire):
  9. Power supplied by the PCM to the FP relay coil to activate the relay.
  10. NOTE: The wiring diagram illustrations in this article cover only: 1993 4.3L, 5.0L, and 5.7L GMC/Chevrolet pickups with the 4L60-E automatic transmission.

    Fuel Pump Relay Diagnostic/Troubleshooting Notes:

    1. FP relay terminal A (ORG wire):
    2. Should have 10 to 12 Volts DC with Key On Engine Cranking or Key On Engine Running (KOER).
    3. This voltage comes from the GRY inline fusible link located in the engine compartment junction block.
    4. FP relay terminal E (GRY wire):
    5. Should have 10 to 12 Volts DC when the engine is being cranked and relay has activated.
    6. FP relay terminal D (BLK/WHT wire):
    7. Should have ground all of the time.
    8. FP relay terminal F (DK GRN/WHT wire):
    9. Power supplied by the PCM to the FP relay coil to activate the relay.
    10. Fuel Pump Troubleshooting Notes:

      1. Oil pressure switch:
      2. If the fuel pump relay fails, what usually happens is that the oil pressure switch feeds power to the fuel pump and gets the engine started and keeps it running.
      3. When this happens, the engine will crank till the oil pressure gets up and the oil pressure switch closes.
      4.    Fuel pump in-line fuse -20 Amp.
           Junction block.
           Fuel pump relay.

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