Small Engine Troubleshooting Problems? Ask a Mechanic Now.
See link above, the fuel tank outlet is in the top of the tank, the fule pump has to suck the fule from the tank, not gravity flow. So the suction tube, and hoses and filter, all the way to the fuel pump inlet, has to be vacuum tight. Do you have a vacuum pump to test it? If you hold your finger over the fuel pump inlet, do you get a vaccum feel when cranking?