Weak fuel pump?

The psi comes from resistance. With the line full open you would see very little or no pressure.
If 125 GPH is correct, that's about 2 gal per minute, and you got 1 gllon in well over a minute... thats half gassed. Pardon the pun.

I think I found my problem to be the bowl vent not opening. Makes me feel stoopid too. :banghead:
I'll know for sure in a day or 3. It runs so smooth right now that I can idle it down to dang near nothing and ride the rockers / adjust the valve lash.
I'll paint and reseal the rocker covers too while waiting for the parts needed back at the fuel tank.