More than a simple nuisance, a noisy fuel pump foreshadows problems in the fuel system which could lead to failure further down the line if not resolved. A correctly working fuel pump should be operating quietly or as low in sound as possible. But when it starts to make a loud whining noise, that usually means that it is straining or starting to fail. Fuel pumps usually operate within the range of 30 and 80 psi, when this pressure goes down, the pump may try to compensate for that high pressure which results in making a louder noise.
Common problem: The most common cause of a noisy fuel pump is low fuel. The pump, which typically has fuel to lubricate it, will run dry and it will produce more friction and heat, resulting in a louder noise. The absence of lubrication also reduces pump longevity by 30%, therefore, to prevent overheating, the tank should never below quarter full.
A clogged fuel filter is another frequent reason for a noisy pump. If a filter inhibits flow of fuel, the pump simply has to work harder to push fuel through the line, creating noise. It costs $20 to $50 to replace a fuel filter, but run a clogged one and you may have to replace the fuel pump — $400 to $600.
Talk about noise from the fuel pump might also relate to electrical failings, like lack of voltage input into the pump. Dropping below 12 volts, the baseline operating level for most fuel pumps, may cause the pump to work harder, decreasing its efficiency and producing a buzzing or whining noise. A common fix once properly diagnosed, electric motor service professionals or automotive experts will tell you to inspect wiring and relay systems as these are voltage issues that can easily be avoided with regular caution.
A noisy fuel pump is like “a person trying to yell in a crowded nightclub: a hell of a lot of noise, but barely audible between the beats and bass lines,” as automotive technician Tom Magliozzi of “Car Talk” put it. Keeping the fuel system clean should be the best way to prevent these problems. Know more on how to take care of your Fuel Pump; read more resources here;