Carb not getting gas

[Paul]

Hey all. I have a 72 Grumman motorhome with a 392 IH V8.

The carb isn't getting gas.

I connected a boat gas tank with a pump ball to the inlet of

the mechanical fuel pump. 

That gave me gas but I'm not sure how those pumps work.

If it had a torn diaphragm then maybe the gas way just pulled

thru without being pumped?

Anyways supposing that the pump is good what sort of issues

can be present in the actual tank?

I have 3 days left of my RV rehab week off and would love to get

her running off the gas tank!

And I don't get a lot of vacation to get this stuff done.

Many thanks!

[Paul]

Ok. So if I disconnect the fuel line to the carb and hit the ignition I feel a pulse.

So it looks like the tank is the issue. Looks like I'll have to disconnect the fuel line where I'm able to let me drop the tank. Before I do that is it worth blowing compressed air back from the fuel line at the pump?