trouble priming fuel bowl. finally get the bowl to fill, motor starts then quits.fuel bowl empty. pumping bulb again i see some gas in the top of the carb and can hear air, but motor will not start . i checked the gasket in the bowl and it looked pretty thin and worn. made a new one while waiting for a replacement and at first got the bowl to fill easily. now the problem i just described. i have the kit to rebuild the fuel pump, but is the pronlem elsewhere? the motor has good compression. any thoughts?