Replacing a failing fuel pump relay requires a few specific steps, each crucial to restoring proper fuel pump functionality. The relay is responsible for providing power to the fuel pump, so when it fails, the fuel pump will not operate correctly. First, it’s important to locate the fuel pump relay, which is typically found in the vehicle’s fuse box or relay panel. This can vary depending on make and model, but inside the cover of most fuse boxes there is a diagram detailing where exactly the specific relay is located. Consult either the owner’s manual of your vehicle or go through repair guides by Haynes or Chilton for this information.
Next is to check the relay for any visible damage such as burn marks or corrosion on the pins. The continuity of the relay can be checked using a multimeter. A faulty relay will not read any continuity once the multimeter probes are connected. Relays usually run between 10 and 50 dollars depending on the type of vehicle and manufacturer.
Given the identification and confirmation that, in fact, this was a faulty relay, removal of the old one usually needs only to be taken from its socket and a new one inserted. Less than 15 minutes would complete this job. It shall be noted, though, that for more sophisticated motors with newer modules-even a fuel pump control module-it is best advised one consults a professional or refers to service manuals about proper installation.
In some cases, if the relay replacement does not resolve the issue, other electrical components such as the fuse or wiring could be at fault. The industry standard estimates that 15% of fuel pump relay failures are due to faulty wiring, usually resulting from corrosion or wear. This check and replacement of the wiring with any damaged components will ensure a long-lasting repair. The cost of such additional repairs can vary, but the cost of replacing faulty wiring normally ranges from $100 to $300, depending on the complexity and labor involved.