I'm looking for a mechanic/Shop that regularly does work on older trucks. I have a 86 super cab F-250. The front gas tank is venting gas out at the cap. if I pull over and unscrew the cap at the front tank I get about 300ml of gas puke out of the tank. I always fill the rear and use the rear tank, but it seems gas is finding it's way to the frnt tank somehow, building up pressure as the engine runs then venting. I have read alot of posts re: this.....any help would be appreciated. a good shop or private mechanic.