Humming noises coming from the fuel pump area is normal. It just means the fuel pump is doing what it is supposed to do.
However, if the sound is much louder than usual, it could be from a restricted fuel filter causing the fuel pump to have to work too hard. I would recommend replacing the fuel filter and see if this helps the noise.
Otherwise, it could also be a sign that the bearings in the pump motor are worn and the pump is getting ready to quit on you.
FUEL PUMP FAILING.
SOURCE: can hear a click at fuel pump but no humming..is it the fuel pump??
Was it a factory GM pump? Check for power at the Grey wire going into the pump it should have 12V for 2 seconds after you turn on the key so you cant do it by yourself get someone else to either turn on the key or watch the test light, If you have no fuel pressure but have 12V for 2-3 seconds then you have a bad pump and be sure to double check the Ground make sure its clean and secure also change the fuel filter at the same time. Forget the oil changes they do nothing for the car oh yea change it one every 4 or 5 years is way fiine but change the fuel filter EVERY EVERY 15,000 miles no matter what. If this information helps please give me a fixya rating.
Oh yea make sure you buy a Factory GM pump you'll be gald you did,
SOURCE: I replaced the fuel pump in my 1992 Pontiac Grand
The pump is usually mounted on a rubber shoe on the end where the strainer is attached and the other end is held in place by the outlet hose which is rubber as well. If you did not put that little rubber shoe back on the bottom of the new pump, there will be metal on metal contact between the vibrating pump housing and the mounting post. This will make it much easier for the pump noise to travel up and out through the whole car.
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