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Home >> BMW >> 1990 >> 325is Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Relays >> Fuel Pump Relay
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Fuel Pump Relay

  1. On 325 Series, fuel pump relay is on bracket on left front shock tower (center relay on bracket). On 525i, 535i and 735i, fuel pump relay is located in relay box in right rear corner of engine compartment.
  2. If fuel pump fails to operate, ensure battery voltage exists on Red and Red/White wires of fuel pump relay and that fuel pump fuse is okay. If no voltage exists, check power circuits and ground circuits for the MCU. The MCU controls the ground circuit for the fuel pump relay.
  3. If battery voltage exists at fuel pump relay, note wire color and location on fuel pump relay terminals. Apply battery voltage to the Red and Red/White wire terminals of relay. Ground the Brown/Green wire terminal. Voltage should now exist at the Green/Violet wire terminal of the relay. Replace relay if voltage fails to exist.
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