[flip66]

I have run into the same problem with the pressure in the tank but not the carb. I have tried all kinds of caps none will solve the problem they all say they are vented but I still have the same problem they do not vent out. I can leave the truck setting in the sun on a warm day and remove cap and it will push the cap off and spray gas out. The heat from the sun will make mine build up pressure. Is anyone else have this problem. The gas cap for the 71-72 are different then 67-70 the 72 is smaller I have a 71 and a 72 tank and the cap that fits my 69 will not fit them.