Before doing anything at all:
HARD STARTING, HOT
Difficult starting of a hot vehicle from 5 minutes to an hour after the engine has been operated, can be caused by the volatility of modern fuel. If you have this problem; try using the following method to start the engine: DON’T touch the footfeed (VERY important). Crank the engine over from three to 5 seconds (different vehicles will respond to different times); and then GENTLY (so as not to activate the accelerator pump) press the footfeed approximately 1/3 of its travel. The engine should start, and may run rough. Run the engine at a high idle for about 10 seconds. This issue is caused by volatility of modern fuel. Once the engine has been shut off, the gasoline is heated by the latent heat of the engine, and percolates the fuel from the bowl into the throttle area, forming a mixture that is too rich to fire. If you push the footfeed to the floor (as has been the traditional method of “unloading” a flooded engine) the gasoline continues to flow into the engine (again due to the volatility). By not touching the footfeed, you do not open the throttle plates, and the engine will pump the overrich mixture out of the tailpipe. Once the overrich mixture has been alleviated, gently opening the throttle will allow the engine to start.
The above is from the "Troubleshooting" section of my website.
While I tend not to disagree with Jerry generally, I do not think the float is at fault since you stated the engine started right up after 20 minutes.
You might consider setting the idle RPM maybe 50 RPM higher, which might help with the stalling issue.
EDIT: and if like so many enthusiasts you might be using 93 octane (or av gas or race gas) DON'T! Use the lowest grade fuel you can find at a name-brand station! The higher octane fuel will increase the problem.
Jon
Last edited by carbking; 06/17/2019 6:33 PM.
