To check a fuel pump, its pressure and electrical function must be measured or at least verified, and then there must be an inspection of the fuel pump to see if it is clean looking, free of rust and metal shavings, and does not show signs of having been dry for a significant period of time, which we will accomplish in a few steps. Read through a fuel pressure check, attach a fuel pressure gauge with the test port with the gas rail, then measure strain using the engine operating. Nearly all fuel-injected systems need 40-70 PSI, and anything less could be a sign that the pump is failing or the fuel filter is clogged. Mechanics advise this test at different RPMs to ensure the pump can provide constant pressure when the engine is idle and when it is under load: if the pressure fluctuates then wear is generally suspected of the pump work.
This is where electrical testing comes in, because fuel pumps rely on a consistent voltage supply – normally 12-14 volts. Check the voltage at the pump’s power terminals with the help of a multimeter. If it is lower than expected, examine the wiring and connectors to spots of corrosion — or a buried wire on a plug socket — as this accounts for roughly 15 percent of fuel pump failures. Bad connections can disrupt fuel delivery intermittently, leading to poor engine behavior and potential stalling when accelerating.
Another clue indicating the fuel pump is likely sick is if you listen for strange noises. If the pump sounds like a high-pitched whine or grind, it is a sign it is under duress – which usually means the filter is clogged or the fuel is low. According to a report from the American Automobile Association, strange noises coming from the pump is one of the first signs of a failing pump, especially in pumps that have over 100,000 miles of service.
Slight corrosion or leaks are checked around connectors, seals, and in the pump housing. Seals or hoses could need replacing if the fluid is leaking, particularly around any fittings. Ed China, fuel system expert and star of TV series Wheeler Dealers says, “A visual inspection can prove just as invaluable as mechanical testing when gaining an insight into pump health, so look for any telltale signs of wear.”
A high-quality Fuel Pump that is compatible with your vehicle will avoid any hassle during the operation or performance of the fuel pump and will allow your vehicle to run in perfect condition for a much longer period of time in different driving conditions.