[marcmojo]

On hot days with less than half a tank- I get occasional hesitation. Open tank whoosh out comes a bunch of air. Air valve in trunk seems designe to let air in- not out- how do we let air out? I have read some other posts on this- but they all seem to be a different problem.

 

[lowmileage]

FWIW, you might want to paint the bottom of the gas tank silver. This was a "period modification" on some cars where the tank took in the reflection from the road (when they had dark/black painted trunk bottoms). The silver would reflect when the black would absorb. Might help you or it might not.