Ford 4100 carb

[kapejo]

Recently rebuilt 390 has 600 miles on it.
The car starts perfectly when cold and idles down properly as it comes off the choke. Once warm, it will start immediately without any throttle, but if we wait aminute we need to give it full throttle to re-start it. What we have found is that gas starts dribbling down the venturi tubes in both the primary and secondary openings when the engine is off, thereby flooding the warm engine. The floats are at book spec.

Any thoughts...,
Thanks

 

[sseebart]

It sounds like a heat soak issue. Modern ethenol gas blends boil at a lower temperature than pure gas. Typically, that means that the fuel in the carb is vaporized after sitting on a hot engine for a while.

I had this too and was able to better the situation with a thin spacer under the car (I got a wood spacer made be Edelbrock, but phenolic is also available). I don't have a stock setup, so had clearance under the hood for the extra height.

Does your car have the water jacket spacer under the carb? If so, you may want to check to see that you're getting a good flow through there--it's designed to cool the carb down.

~Steve

 

[kapejo]

I get to answer my own question for this particular issue...
A relatively easy fix. The floats were set too high. Runs much better now.