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oh mighty ttora oracle...

did some searching, but I'm not exactly sure what I'm looking for:

'04 dcab, ~50k miles... After driving around for a bit -- say 40+ miles, when I turn off the truck, I hear this strange "whomp whomp whomp" sound coming from the gas filler/neck area. If I remove the gas cap, the sound goes away.

I'm thinking it's some kinda funky vacuum issue; but that's pure speculation.

any thoughts?

thanks,
ryan
 

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i'd say vacuum. exactly what you're thinking would be my guess
 

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Sounds like a problem with your evaporative emmissions system. It is probably pressure build up. Your gas cap is made to vent too much pressure and that is the sound you are hearing.

Evap emmisions should be under warranty yet.
 

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averkam said:
Sounds like a problem with your evaporative emmissions system. It is probably pressure build up. Your gas cap is made to vent too much pressure and that is the sound you are hearing.

Evap emmisions should be under warranty yet.
i was just gonna say try a new gas cap but i like your answer too.
 
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