moaning sound

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  #1  
Old 03-03-18, 12:46 PM
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moaning sound

HAVE 1996 Lincoln Town Car and after it is started and you drive it you can often hear a moaning sound.....come to find out it is coming from the gas filler tube area. Anyone have any idea what might be causing this? It is weird, you stand next to the filler tube you can hear it and even hear a hissing noise like there is pressure relieving itself, it just baffles me.
Love to hear from someone.
 
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Old 03-03-18, 12:55 PM
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Does it have the correct cap on it? Some tanks require a vented cap.
 
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Old 03-03-18, 01:16 PM
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To my knowledge it has always had the same gas cap so i cannot answer your question. Never heard this noise before.
 
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Old 03-03-18, 01:20 PM
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Sounds like the ORVR (Onboard Refueling Vapor Recovery) system may be leaking.

There is a pump that sucks the vapors out of the fill neck and sends them to a canister which then gets fed back into the engine to burn.

Another EPA requirement.

You may need a new gas cap, not necessarily a vented one but one that seals so the system can work properly,
 
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Old 03-03-18, 10:08 PM
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not uncommon for the fuel pump to make some noise the fuel pump should come on for a couple of seconds to prime the fuel system when you first turn the key on and then go off until you start actually cranking the engine to start it then it will come back on.
so cycling the key on and off for 10 seconds then back on to see if it is what you are hearing run.
 
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Old 03-04-18, 04:07 AM
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Before an electric fuel pump goes out they get noisier. That is generally pretty easy to diagnose.
 
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