Diagnosing and fixing a fuel pump that’s losing power involves inspecting the fuel system, electrical connections, and the pump components themselves. Fuel is pumped with constant voltage, adequate wiring, and necessary pressure through a clean fuel line to maintain engine power. Low voltage, clogged filters, or worn internal components can cause power losses and inefficiencies.
To do this, use a multimeter to check the voltage at the fuel pump connector. A normal circuit will provide 11.5 to 12.6 volts. If voltage is low, check the wiring harness for breaks or corrosion, and clean or replace the damaged sections. [Automotive Diagnostics Weekly had a 2021 report that said 30 percent of fuel pump failures are caused by corroded electrical connections or damaged wiring. Cleaning the contacts usually with electrical cleaner to restore connectivity and conduction.
Make sure the fuel filter isn’t plugged up, as that’ll slow down fuel flow and cause the pump to overwork, resulting in power loss. If the filter appears to be clogged, replace it. The 2022 Fuel Systems Efficiency Study found that a clogged filter can reduce pump efficiency by up to 40%. It also extends the lifespan of the pump and keeps the power output to remain steady.
Another important step is checking the fuel pump relay. But replacing it with a known working relay helps in troubleshooting. If the pump works with the replacement, the relay is faulty. Failing relays can cause sporadic power loss, interrupting fuel supply.
Pressure testing with a fuel pressure gauge tells you whether the pump is supplying the pressure specified by the manufacturer. Low readings mean wear inside or broken pump parts. An example of this is if a pump can’t hold the desired 40-60 psi found on most vehicles, it may have damaged seals or impellers. You might need to replace these components or the complete pump.
Henry Ford once said, “Coming together is a beginning, keeping together is progress, working together is success,” and with that in mind, we need to look at it this way: addressing fuel pump issues from the start ensures that the system stays in harmony. Disregarding those warning signs can result in costly repairs and downtime for your vehicle.
Discover Fix & Upgrade Solutions for Your Fuel Pump To maintain consistent power delivery and reliable vehicle performance, avoid breakdowns, and extend the life of your fuel system