Pull the air cleaner and start the car while looking down the carburetor. Operate the throttle to keep it running if necessary. Look for proper atomization of the accelerator pump shot. If you can plumb in a fuel pressure guage, do it. You need a minimum of 4-5 lbs of pressure with a max of around 8. Any wild swings of the guage could mean that the fuel pump pushrod is wearing out, not giving a full stroke to the pump. The line may fill with gas but the pressure will be below acceptable levels. NEW fuel pushrods are available from Mancini Racing.