1990 BMW 325is AutomaticFACTORY OEM SERVICE PROCEDURE

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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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.

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