How long is a while?
And also, it wasn't holding the gas down, you had to tap it for some reason, UP-DOWN-UP-DOWN-UP-DOWN-UP-DOWN-UP-DOWN as FAST as humanly possible. Hence taking 15+ attempts to start it.
I've had gas in a vehicle for 9 months and it fired right up after the lines charged. Never had so much presure in a tank in my life though. Maybe you got some water in it. Try draining it, putting in a couple galons with a little bit of HEAT in there. Nice thing is, not only does it prevent freezing, it also removes water from the gas.
