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Smelling gas inside car. No visible leaks

(1999 Pontiac Montana)
in Somerville, TN on June 27, 2011
The fuel tank pressurizes and gas smell is strong inside car.More in hot weather. Fuel tank blows back hard when the cap is removed.
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on June 27, 2011
The most likely cause of your concern is a malfunctioning evaporative emission system. This system contains the raw fuel vapors and burns them in your engine when the computer opens a valve electronically. A clogged carcoal canister may be the culprit, but a professional that understands the system needs to give it a look.
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on June 28, 2011
Thanks, I changed the canister some time back but that didn't help.
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