I put a new gas tank on the cutlass............ here is the problem.......my old gas tank was leaking gas from the bottom but before that the car ran fine now my other problem is this I have 3 fittings for the gas tank correct ..........if ur standing in the back of the car its 1 fitting on the drivers side and 2 on the passengers side and a fuel sending unit which means 4 lines correct.............now the fuel sending unit has 2 lines.......is it possible that I can put a rubber cap on the narrow line of the unit and let the larger line run free if so I did that and the car is still not releasing gas from the tank up to the engine what could my problem be and btw I did blow all the lines out with a air tank and its a new fuel pump on it........????