How to replace my BMW 525 fuel filter

Updated July 20, 2017

Fuel filters are an important component of the BMW 5 Series automobiles. Fuel filters remove dirt and debris from the fuel supply. BMW 5 Series models have fuel-injected engines that are susceptible to damage if the fuel filter fails to catch foreign objects. The fuel filter should be replaced at intervals specified by the manufacturer. Failure to replace fuel filters in a timely manner can lead to engine shutdown, poor performance and power surges.

Locate the fuel pump relay, which is located under the hood on the passenger side near the firewall. The fuel relay will be either light green or blue in colour. Remove the fuel pump relay from the connection and store safely. Crank the vehicle and idle until it runs out of fuel.

Disconnect the negative battery cable from the battery using a metric wrench.

Locate the fuel filter, which is located on the passenger side of the car, behind the rear tire and in front of the gas tank. The filter will be attached to the bottom of the car with a bracket held by a bolt.

Remove the fuel filter bracket by loosening the bracket bolt with a ratchet, extension and 12mm socket.

Place a fuel line clamp two inches from the fuel filter toward the gas tank.

Position the catch pan under the fuel filter to prevent a fuel spill. Use the screwdriver to remove fuel line clamps on each end of the fuel filter.

Using the pliers, remove the fuel filter from the fuel lines.

Position the new fuel filter with the flow marking pointed toward the front of the car and away from the gas tank. Slide each fuel line onto the new fuel filter.

Replace each fuel filter hose clamp and tighten, using the screwdriver. Remove the fuel line clamp.

Secure the fuel filter with the fuel filter bracket. Tighten the bracket bolt with the ratchet and socket.

Insert the fuel pump relay into the connection and connect the negative battery cable to the battery.


Details and specifications may change with model years, so consult a repair manual specific to your model for additional information.


A fire extinguisher should be available when any work is performed on the fuel system.

Things You'll Need

  • Metric wrenches
  • Ratchet with extension
  • Metric socket
  • Fuel line clamp
  • Catch tray or pan
  • Screwdriver
  • Pliers
  • Fuel filter
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About the Author

Keith Perry has been an employee and contractor for several large companies in various information-technology jobs. He holds an executive Master of Business Administration from Jacksonville University with an undergraduate degree in computer science from University of North Florida. He began writing for Lotus Notes Advisor and Mobile Advisor publications in 1998.