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The Location of the 525i Fuel Pump Relay

by Gregory Crews

The BMW 525i has an electric fuel pump. The pump is located in the fuel tank and relies on an electrical relay to send electrical power from the battery to the pump. A faulty relay can have the same symptoms as a bad fuel pump. The best way to determine whether the problem is with your relay or your pump is to locate the relay and test it.

Ensure that the car is turned off. Open the hood for access to the engine compartment.

Locate a black box mounted to the passenger side fender. The box will have bolts keeping a cover secured to it.

Unscrew the bolts with a socket wrench. Lift the cover off and place it aside. The fuel pump relay will be labeled by the diagram in the fuse panel. Follow the diagram to locate the relay.

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About the Author

Gregory Crews has been in the film industry for three years and has appeared in more than 38 major motion pictures and 16 television shows. He also writes detailed automotive tutorials. His expertise in the automotive industry has given him the skills to write detailed technical instructional articles.

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  • 12 volt relais, relay image by Sascha Zlatkov from