Ford LRG - 425 starting problem

Gents,
Grove AMZ66XT manlift I have refurbished. Built in 1999.
Engine is Ford LRG - 425 (carbureted, dual fuel propane/gasoline, but I am running only gasoline).

One problem I've been working around, looking for suggestions:
Starts fine when cold. When hot, after shut down, later it won't restart. It will crank but won't fire.
Once running, runs fine.

I discovered if I leave the electric circuit on after engine shut down then it will restart later.
This works if I shut down with the...

Ford LRG - 425 starting problem

Ford LRG - 425 starting problem