Vacum canister leaking? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-06-2014, 01:53 PM   #1
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Default Vacum canister leaking?

2003 Lesabre, 113,000 miles.

I hear a "metal popping" as I exit my Buick after shutting off the engine. The metal popping noise is the same noise the old one gallon paint cans make when the temperature changes. Any suggestions? I am thinking the fuel vacuum canister is leaking but it is plastic.

Also my "Check gas cap" flashes in the DIC. I replaced the gas cap with an Autozone cap and replaced the 3/8" main steel fuel pipe-filter along with the two steel 5/16" recovery fuel line and canister pipe. The check gas cap came first before the popping noise.

Any suggestions?

Mike from Cleveland
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Old 11-06-2014, 02:10 PM   #2
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Is there any indication of a vacuum build up in the fuel tank when you remove the gas cap?
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Old 11-06-2014, 03:05 PM   #3
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I agree, sounds like the vent solenoid might me stuck shut causing excessive vacuum in the tank. There is a pressure sensor in the tank that monitors whats going on, usually it sets a code because there is a leak and it can't build any vacuum, sounds like you have the opposite problem and have too much vacuum.
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Old 11-06-2014, 07:02 PM   #4
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There is no build up of vacuum in the fuel tank. Also, I forgot to mention the "Check Engine Light" is illuminated. The light cleared up once but is back. The code is something like A404, not sure on the code.
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Old 11-16-2014, 09:58 PM   #5
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Update, I found a partially rotted wire clamp and loose hose fitting on the vacuum charcoal canister. Replaced with stainless steel hose clamp and "Check Engine" light reset itself.
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Old 11-17-2014, 12:55 AM   #6
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heat shield can make that sound around converter its normal
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