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Q: Smelling gas inside car. No visible leaks on 1999 Pontiac Montana

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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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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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