My 73 Roadrunner is building pressure in the fuel tank when I drive it. I have the vent system connected with all new line from the tank to the air cleaner on the engine but I'm still making pressure. I will deal with the vent system this winter when I have time but for now I just want to put a band aid on it and put a vented gas cap on it. Does anybody have a part number for a vented cap for this car?

Mine was building vacuum in the tank so I drilled a tiny hole in the gas cap. Problem solved, I never noticed fuel leaking out of it. I later changed to a cheap looking plastic locking gas cap and that one was vented and worked nicely.