Carb hot start questions Options

[mb911]

My car runs really well. Cold starts great. Has phenolic spacers etc but after I shut it off I have to have the throttles open at least half way and crank for 5-10 seconds to start. If I don't open the throttles then it will sound like timing is to advanced but clearly is not and it will stumble until it clears out.It has to be some excessive fuel getting down the throats somehow? What to check? Floats sticking?

[slivel]

Is your hot start problem new or has it existed for a long time? If new, has your fuel consumption also increased? Once hot and re-started, I would pull the air cleaners and look down into the carb throats. If you see fuel dribbling visibly at idle, then you have a float problem. Possibly a float with a leak so that it is no longer fully dry inside or possibly a stuck float needle, or lastly just a fuel level that is too high in the bowl.

I also had my 46's overhauled by Performance Oriented and he did a fantastic job, but I did reset my fuel level a little bit when I got the carbs back (this was a long time ago - 10 + years). My car always cold starts reluctantly when the car has sat for a long time (weeks) or if the temperature is cold. I have had to use starting fluid a time or two when at the track and overnight temps dropped into the 30's. Once hot the engine always starts immediately.

Lastly, check your fuel pressure. I run 3.5 psi.