Ok I need help it seems my gas gauge is now not working correctly as it is almost always sitting on empty but when I try to fill it the gas spews out of the tank. Mostly my concern is the fact that when I open my gas tank there is so much pressure being released and I have no idea what is causing it. The car runs and drives fine but the pressure and the gauge are worrying me. I also just replaced the original gas cap with a locking ventilating one from the parts store.
77' Datsun 280
just bought the car, looks stock to me no mods on the car