I have a '70 455 ,which is totally rebuild, installed in a '69 electra 225 and today i wanted to fire it up for the first time, building up oil pressure was not a problem, but when i wanted to start it, nothing happend because the fuelpump wasn't pumping I could feel some pressure differences when i took the fuel-line off and held my finger on the pump and let somebody start it, how is this possible everything is new, the camshaft the fuel pump and i could suck the fuel up with my mouth quite easily so why doesn't the pump suck the fuel up???