Carburetor Boiling Issue
I just put a union in place of the existing regulator and ran the new line to the new replacement return regulator. I tried all the heat spacers , They didn't work with this new ethanol fuel .
The reason it floods when restarting is from the bubbling, boiling fuel coming in cannot lift the float against the dead ended pressure to shut the fuel off. The return lets the hot bubbling fuel bypass the carb and allow the floats to work.
Been through this on several builds with all different carburetors. If you have an electric pump you can shut it off and on until you get solid fuel coming in and it will run.
Holley 12-881 Holley Carburetor Bypass Style Fuel Pressure Regulators | Summit Racing
I have an aluminum spacer. The return is what corrected my boiling issue when restarting it hot. I had the pressure regulator before the carb, I had to buy a return style pressure regulator and install it after the carb eliminating the other one.
I just put a union in place of the existing regulator and ran the new line to the new replacement return regulator. I tried all the heat spacers , They didn't work with this new ethanol fuel .
The reason it floods when restarting is from the bubbling, boiling fuel coming in cannot lift the float against the dead ended pressure to shut the fuel off. The return lets the hot bubbling fuel bypass the carb and allow the floats to work.
Been through this on several builds with all different carburetors. If you have an electric pump you can shut it off and on until you get solid fuel coming in and it will run.
Holley 12-881 Holley Carburetor Bypass Style Fuel Pressure Regulators | Summit Racing