You know what's screwie..Trying to fine air leaks from drains traps...we had to re dig the darn entire block.lmao
Of course Mr. Murphy was around...becuase out of darn 20 houses, it was that last one.
I don't mine new plumbing...it's the used ones.[:'(]
Thank god it was new houses..becuse my buddy hit the gas line...and I counldn't get out of the hole fast enough.
I ran like hell He was stuck in the excuvator.lol
That was a good AIR LEAK..lmao...They only had air in it incase we hit it.lol

Well..I heard B1s take off for 4 years of my life. Those 4 after burners are narley.lol

Anyway, I was have a similar problem with the GP cap 232. I couldn't get that darn thing to prime
no matter what with a starter. But I was thinking the tank was mounted too low and too far back,
plus all the crazy bends I did for the rear needle valves.
I used three different pitt style type muffuler...and still no dice.
So I put another engine with a front needle..and she fired right up.

On a trianer i usually just blow into the return line.
Humm...maybe I'll try a syringe with sometype of fuel tubbing adaptor..so I don't have to blow.lol

Maybe some debris got stuck in the carb's orifis and worked it's way through.
Or maybe the seal to the tank it too dried or cracked.