fuel leaking fillercap

can Anyone tell me how to solve the problem of a leaking fillercap? I replaces it for a new one but still when the car is on it side( not all the waY of course) it is leaking.

any advice?

Thanks Juffer

 

well I have been working at this for a while now,,,the cap seals the opening , trouble is you need a vented cap .and thats where it's coming from. I am now running a cap from napa and I have welded up the main vent hole and pluged two of the side vents in the cap .2 are left...... I have run the jeep at speed and not starved it out yet.thinking of going for another hole. gas is so expensive now and the fear of fire (draging body across a gas soaked rock ,not good.) bought a roll over ball vent like the ones they use on buggys, but the trouble with those is it would have to roll and land upside down to block it off , land sideways and fuel would soak you......... please keep me posted on this one .Pat,,,,,, I don't see how the mts tank and cap will keep it in. is that cap vented?can you get me a pic

 

If you bought the roll over valve with pipe thread on the outlet, then run a hose from it into the air cleaner so that the fumes will be pulled into the carb. On a steep side hill the fuel will run up the long hose, but when you get back to level it will run back into the tank.