The Ford Barn

Daves55Sedan · 02-07-2016, 06:36 PM

I noticed that my original '55 Ford EBU carb leaked gas out around the valve shaft (where it connects to linkage actuator) after engine is shut off. Engine will not start unless enough time has passed for leak to dry up.
So, I took that carb off and put on a Holley 2100 (identical to the Ford EBU carb). It has a new rebuild kit from Daytona parts. It leaks exactly the same way. Gas pours out on the heat riser passage of the intake manifold for about five minutes. Looking inside the carb after engine is shut off, the two valve plates at the bottom are very wet with gas, but I cant see gas dripping from anywhere.
The Holley carb surges slightly at idle speed. I took the top off the carb and checked the float setting. It is good and the engine does not die when I come to a stop sign.
I used a vacuum gage to adjust the idle/fuel mixture screws and noticed the best intake manifold vacuum I could get was only 18". It should be 20".
I don't know if that is related to the leak or the surging.
The fuel pump is 2 years old and it is a dual-action fuel/vacuum type. Fuel filter is a see-through type and looks good.
Any suggestions?

02-07-2016, 06:36 PM	#1
Daves55Sedan Senior Member Join Date: May 2010 Location: Granite City, Illinois Posts: 3,008	55 Ford carb problem I noticed that my original '55 Ford EBU carb leaked gas out around the valve shaft (where it connects to linkage actuator) after engine is shut off. Engine will not start unless enough time has passed for leak to dry up. So, I took that carb off and put on a Holley 2100 (identical to the Ford EBU carb). It has a new rebuild kit from Daytona parts. It leaks exactly the same way. Gas pours out on the heat riser passage of the intake manifold for about five minutes. Looking inside the carb after engine is shut off, the two valve plates at the bottom are very wet with gas, but I cant see gas dripping from anywhere. The Holley carb surges slightly at idle speed. I took the top off the carb and checked the float setting. It is good and the engine does not die when I come to a stop sign. I used a vacuum gage to adjust the idle/fuel mixture screws and noticed the best intake manifold vacuum I could get was only 18". It should be 20". I don't know if that is related to the leak or the surging. The fuel pump is 2 years old and it is a dual-action fuel/vacuum type. Fuel filter is a see-through type and looks good. Any suggestions?