Things that make you go Hmmm... - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-01-2002, 08:09 AM   #1
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Default Things that make you go Hmmm...

I have been hearing a hum from what sounds like the rear/trunk area for a while now. If the radio is on or everyone is talking you do not hear it. However if everything is quiet and you are stopped there is an audible hum from the rear of the car. I think it may be the fuel pump but I do not know. Is it getting ready to die or just showing noise because of age? Ideas anyone??

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Old 10-01-2002, 08:49 AM   #2
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This "HUM" could be anything from rear tires (Tread on road) to who knows. See if the noise is still there if the car is NOT in motion first. If it is still there it may be the fuel pump & you should be able to hear it from standing next to the filler tube. If it is not still there then it'* your tread pattern of your tires hitting the road. A rock or something may have been lodged into the tread somewhere.
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Old 10-01-2002, 08:54 AM   #3
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Another thing to listen for (if it comes while in motion) is to see if the frequency of the noise changes with speed.
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Old 10-01-2002, 09:55 AM   #4
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I see where Will is leading with his... might be a bad ground and or RF interference going through the radio.. and in which case.. you can hear the hum coming from usually the speakers....
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Old 10-01-2002, 10:18 AM   #5
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Or a tire or bearing problem that gets more severe with speed. I get the hum a bit from the speakers, but I'm pretty certain my stock (75k) wires are shot.
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Old 10-01-2002, 11:01 AM   #6
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Default Hmmm noise

I do not hear it moving, but as stated earlier when I am stopped is when I always hear it, radio off, etc. I do think it is the fuel pump......don't know why it would be making a humm noise though.......anyone ever changed one of these. I think it is in the tank so this might be best left to someone else..........??
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Old 10-01-2002, 08:23 PM   #7
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What you're describing does sound like the fuel pump. They all make a little noise.
My experience has been that the hum is probably normal. When you hear a higher pitched whine, it can be a sign that the fuel pump is on it'* way out. The hum you're describing doesn't sound too serious. Just pay attention to it and see if it changes to a loud whine over time.
If you listen to vehicles cruising by in a parking lot, some of the fuel pumps are very noisy. Some kind of sound like a mosquito on steroids... That'* the time to get concerned.
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Old 10-01-2002, 09:01 PM   #8
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If it is the fuel pump then you don't want to change it unless you have to. It'* a 3 Hour book time job BTW.
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