Fuel pressure drop

[Jim_Ferrell]

I am using a Holley fuel pump, regulator, and 750 carb. I have the fuel pressure set for 7 pounds when running and every thing is cold. As the under hood temperature goes up, my fuel pressure goes down to almost zero.

Twice (after it was hot) I had a hard time starting it until I let the fuel pump run for 20 seconds before starting. Once running, it seems to get enough fuel but I am worried about running lean.

I can dial up the pressure when hot but it is too high when cold; I am worried about flooding the carb and hydro-lock.

I put an ice bag on the regulator between sessions yesterday at Autobahn and the pressure comes up. I also added gas to the tank at lunch and noticed a big jump in pressure; I guess the gas in the buried tank is 60 degrees and that cooled my tank, and provided in line cooling to the regulator.

The regulator and canister filter are mounted forward of the engine on the passenger side frame at the control arms mount point. I have thermal wrap on the stainless fuel lines but not on the canister or the regulator. The pump is mounted below the gas tank on the rear frame rail.

Thoughts?

Jim