The car is a former racer and is gutted as far as emissions. The new tank is the same as the one I pulled. One soldered 1/4 inch nipper on top by the sender . I looked at the cap and it has no vent I can see . The rubber gasket is for **** and dont look like it would seal anyway. Can I just run a line from the tank nippel with a circular bend up above tank level? Kind of like the one in my 68 roadrunner. But that has 2 nippers on the tank. It has to vent some place even with the suspect filler cap. Think I will give it a shot and see what happens. When I get it on the road summer time heat will be the acid test. Will report back then .