No fuel to engine

[bluef250]

The truck has gas and the lines are open to the pump. The pump is new. Lines are open to the carb. Carb was rebuilt recently. I am thinking the problem is the cam running the pump. Any thoughts?

[Ranchero50]

Prime the pump. Simplest way to use a shop vac and hook the hose up as a blower and pressurize the tank with it. Leave the carb end unhooked and push until the fuel comes out there.

[cep62]

If priming doesn't make it pump you can remove it and pump it by hand.
if that works make sure your "new" pump is correct . can you match it up to the old one?

I once had a pump the was used very little and then sat in a none running engine for a year or so.
When I tried to use it it didn't work, so I tried an old grubby one that sat for at least ten years and that one worked.
We figured that the new one sat with tension and the diaphragm failed.

[colnago]

Run the line from the pump to an empty can or jar. Crank the engine. Any fuel coming out? If not, look for a clogged line from tank to pump. If so, then it's upstream.

Could also be a torn diaphragm, although if the pump is new, it's doubtful.

I recently had condensation in my oil. It starved the pump of oil, and didn't allow it to pump. Ended up being a PCV valve problem. Fixed the problem, condensation went away, pump worked. Check for water in your oil.

Joseph