If it was me,
I would remove the carburetor and check for trash. Make sure the float valve seat is clean.
It is not uncommon for the fuel line to ooze and need tightening after a while, expecially if you are running ethanol gas in it. hopefully you are using worm clamps. If you are using spring clamps, The old ones won't fit the 7/16 o.d. line that is common now. The old line was 1/2" o.d.
I have a Chief 1000 and I think that when your tank gets about 1/2 empty fuel will quit flowing if you bypass the pump.
For you guys that don't know, the tank is on the grille, in front of the engine, not above it.
If you don bypass the pump, run the line directly to the carburetor, don't try gutting the pump and going through it. If you do you will probably be creating a prime condition for future vapor-lock problems.