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Old 03-11-2019, 09:59 AM   #1
Vwsnoopy
 
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Default Mysterious noise while parked

Iím on my 2nd 93, the first being a 4 cylinder and my current is a 6


On both while parked I have heard a noise like something is running under the bed but it always stops before I can track it down. The truck could have been parked for more than a day and Iíll still hear it. It is not predictable and Iíd have to guess not often, if I happen to be near, it may or may not do it.

My beat guess is fuel pump but why would it be running while sitting?? Any other ideas?
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Old 03-11-2019, 11:20 AM   #2
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Can you describe the sound? Could it be the exhaust cooling down?
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Old 03-11-2019, 11:25 AM   #3
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Not exhaust. The truck has been sitting for over a day. Sort of a buzzing
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Old 03-11-2019, 04:33 PM   #4
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Hey, I get the same noise I think; kind of a low buzzing hum, starts quick then fades away. Happens shortly after I turn off the engine, then it comes back hours later. I assumed it was pressure in the fuel lines ahead of the pump pushing backwards through the fuel pump, but I really don't know. Would love to know what it actually is; it's a weird hum, makes me think of a cow mooing, but with bees in its throat.
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Old 03-11-2019, 06:33 PM   #5
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That’s it. Only I only hear it a day or so after I have driven it. Not to say it doesn’t do it the same day, I just haven’t heard it
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Old 03-11-2019, 07:43 PM   #6
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Mine does the same. Just always thought it was the fuel pump. Never questioned it until now. The pump shouldn't be running if the key is off. Maybe it's residual power in a relay or something.
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Old 04-27-2019, 07:28 PM   #7
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Something I just noticed; when I loosen the gas cap while the truck is "moo-ing", the noise stops immediately.

My fuel tank has always hissed loudly whenever I open the gas cap; would this be an indication of a wonky fuel pump? Perhaps the strange noise is fuel from the pressurized lines being forced backwards through the pump...?
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Old 04-28-2019, 11:41 AM   #8
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The next time i hear the sound, I’ll loosen the gas cap and see if that stops it
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Old 07-30-2019, 02:07 AM   #9
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I heard the noise again. I was able to loosen the gas cap and the noise immediately went away
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Old 08-22-2019, 07:29 PM   #10
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I’ve had this problem for as long as I could remember. I also thought it was the pump letting pressure loose. I’ve never really thought about it till now.
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