Oct 24th, 10, 12:26 PM
Need some advice. My fuel pump in my 69 has a fuel inlet and a fuel outlet and another fitting I think for a return line. I do not use the return, I use a single line system. So I capped it with a rubber vacuum line cap and a pinch clamp. After about 300 miles it gave out (broke, popped a hole in the end of the rubber cap) and sent gas all over. I figured it was a faulty cap and went to the parts store to get another 3/8" vacuum cap. The parts guy said that vacuum caps will hold for vacuum but not pressure. Is there a special type of cap to cover the return outlet ? The return outlet on the pump is not a screw in , it is part of the pump. I thought that these vacuum caps would work OK but its not going to be relaxing to drive until I get some good advice. Am I doing something wrong , faulty cap or faulty parts guy ?