I've got a 1961 235 in my 1947 chevy pickup motor has just been rebuilt, Got it running yesterday and it sounded great! went to start it today and it's not pumping fuel. Pulled the fuel pump off worked it by hand and it started to pump, Reinstalled it worked for a few turns and stopped again!! not enough to completly fill glass bowl. Any ideas?

Thanks TeeRoy

above all this old truck has taught me patients!