[Arev]

Thank You for your reply..
the strange thing is . it does it without the cap on!
and we did replace the cap.. and also had it tested and it works find..
this is a head scratcher for sure..
the guy that build the car had it for 25 years before we bought it.. and we had it for 10 years.. and just the last 2 years this is happening.
there is no vent on the gas tank other than the gas cap..
you have any other thoughts?

Thanks again