Here is a new one on me. I am having fuel delivery problems and crawled under the car and the (brand new) fuel tank has sucked in slightly on the bottom. The only vent on this tank (1968) is at the filler cap in which it is a little indentation on the rim of the filler tube and the gasket on the cap is cut out to allow the tank to vent. The size of the indentation and the size of the fuel line do not match. It would reason that if I am using 160 gallons per hour of fuel (just an estimate)than the vent should flow the same amount of air otherwise the tank will start to implode? Has anyone experienced this problem? What did you do to correct it. I do not want to vent the tank into the trunk for explosive reasons. What is a good, safe, reliable fix?