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Need to replace my gas cap?


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I think I need to replace the gas cap on my truck. After about 50 miles of driving I'll go back and loosen the cap and immediately I hear air being sucked into the tank, like it is taking in air to displace the gas that was used. Sounds like someone letting the air out of a balloon.

 

Is there a way to test the vent in the gas cap?

 

Is it as simple as going to the auto parts store and picking up one off the shelf, or will it have to be GM?

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It very well might be designed to do that but it shouldn't be taking in that much air when the cap is loosened.

 

I've even looked at the tank itself and noticed that it has started to 'cave in' before from the suction.

 

Once I loosen the cap it expands back to its normal size.

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  • 1 month later...

Just a hint. If you want a locking gas cap. Get a Stant or something other than Fram. I'm not dogging Fram but I have a Fram gas cap and you need to use the key to both unlock AND lock the cap. Whereas other brands only require the key to unlock it. It works great as a gas cap but it's just kind of a PITA to have to lock it with the key. Not sure if the dealer will have a locking cap.

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