gurgling sound in gas tank?? - Mercedes-Benz Forum
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#1 (permalink) Old 04-29-2012, 11:53 AM
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gurgling sound in gas tank??

anyone know what can cause this? i hear gurgling/boiling/flooding sound in my gas tank towards the passenger side of the gas tank
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#2 (permalink) Old 04-29-2012, 06:01 PM
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Gurgling sound?
Did you provide mouthwash? Haha.

Check the vacuum pump for leaks.

Regards,
aam.
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#3 (permalink) Old 04-30-2012, 11:39 AM
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I had the same issue in a Porsche 944 - I believe it is the check valve in the tank - it should let air in when the gas is being used (when running) to displace the volume of used gas with air. If the check valve is stuck, then you are drawing a vacuum.

Unlike any other.
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#4 (permalink) Old 04-30-2012, 11:55 AM
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thanks on the help guys. how do i go about checking it and is it hard to do? i also hear pressure when i open the gas cap sometimes.

also is there a diy somewhere?
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#5 (permalink) Old 04-30-2012, 07:26 PM
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The valve is located under the car, over the diff.
Very hard to see.

This is a combination valve, it is set for pressure and also vacuum.

If this valve goes bad, some people had to replace the gas tank.
As the vacuum collapses the gas tank.

Regards,
aam.
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#6 (permalink) Old 05-08-2012, 01:09 PM
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anyone with pics?
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#7 (permalink) Old 05-09-2012, 09:05 AM
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Quote:
Originally Posted by aam View Post
As the vacuum collapses the gas tank.

aam.
o_O

never underestimate the force of air pressure...

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Mercedes-Benz, W140 S Class S320 (AKA 300SE)

Mercedes-Benz, R230 SL Class SL55 (///AMG)

Mercedes-Benz, R129 SL Class SL500 (AKA 500SL)

Mercedes-Benz, W163 ML Class ML430 (Designo Edition)

Triumph Daytona 955i - SSSA

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W140 S Class 500SEL(sold) - W140 S Class S320(sold) - W140 S Class S500(sold) - W140 S Class 500SEL(sold) - W201 190E 2.3(sold)
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#8 (permalink) Old 05-09-2012, 09:33 AM
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Yeh, I recall some member here posted a picture of his collapsed gas tank a while back
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#9 (permalink) Old 05-10-2012, 01:16 AM
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Quote:
Originally Posted by aam View Post
The valve is located under the car, over the diff.
Very hard to see.

This is a combination valve, it is set for pressure and also vacuum.

If this valve goes bad, some people had to replace the gas tank.
As the vacuum collapses the gas tank.

Regards,
aam.
Just wondering - as a stop-gap repair, if the OP fitted an aftermarket filler cap with a slightly modified (ie less-than-perfect) rubber seal, the tank presumably wouldn't develop a vacuum but a) Would the car run OK? b) Would it be dangerous with say half a tank of fuel? I'm not necessarily recommending it to anybody, but it might be an alternative to a big repair.
Regards
Steve
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#10 (permalink) Old 05-10-2012, 09:39 AM
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If the gas cap 'leaks' you will get a CEL, and may eventually ruin your O2 sensor.
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