What is the proper size for a fuel tank vent when running alky with mech injection and a 1/2 pump, with a -10 line to the pump from the tank? The tank is 4 gallons and mounted about 4 feet in front of the engine. Also at the hit, is it possible for the fuel to slosh back due to g forces and close the rollover vent, thereby not allowing the tank to vent? The rollover valve is mounted on the top rear of the tank. Thanks.