Flchallenger
Well-Known Member
My 4 tank lines are blocked off now and have a vented cap but still getting vacuum build up in the tank. Just put a rebuilt 500 ci stroker in with a 850 quick fuel. Which seems to suck a lot of gas thru that 3/8's inch line. I have the 71 style sending unit with no venting. So I am thinking of running a rubber hose to one of the 4 vent tubes on the tank to the top of the wheel well with a fuel line check valve and a fuel filter for filtering air. Also I don't know about other years but tank cap has a rubber seal to keep water out would also act a barrier for air flow regardless of a vented cap that is not venting enough. What are your thoughts. Also which of the 4 tubes should I use?