maxim

The fuel pump is not too intmidating to rebuild. I had one I ran a while then it started to pump fuel into the crankcase because of a leak in the diaphram. Try to get fresh rebuild parts. Check for leaks along the line to the tank. Maybe put a small spurt of air backwards to the tank to see if the line is clear and you can hear air bubble up. Or try to put a 'pony tank' on the line to the fuel pump instead of using the main tank. If the pump will pump from a pony tank there must ba a obstruction or leak in the line some where. There should be a lever on the side of the fuel pump (unless it has broken off like may) to manually pump the fuel pump and prime the carb, you should be able to detect if there is suction.