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steve_wilwerding

Bucking when cold, moaning from gas cap

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I have had this issue for a couple years. The main symptom is that, after driving awhile, and especially on less than half a tank, there will be a moaning sound coming from the gas cap. If I remove the gas cap and open the fuel filler, air will rush in. The other issue I'm having is that, on cold starts, the car will kind of buck like the fuel is cutting out - it goes away after a couple minutes when the car is warm.

 

I have already changed the valve on the gas filler neck and the valve on the charcoal canister, but neither fixed the issue. I'm now targeting the fuel vent line connected to the throttle body, but having read other posts, it seems like that one generally causes issues with fueling and with hot starts, neither of which I'm having.

 

Ideas?

part.jpg

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Yes, for the 996 engine. I suppose at this point it's a guessing game, and I may as well change the part and see if it helps  

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