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Club Cat uses a micro swithc that kills engine when it comes back to idle. This switch may be loose or out of adjustment. Located in the same box as the starter solenoid. See picture.
Are they adjusted right? Switch will kill engine if it is not in right place!
You say it shuts off like the key is turned off? And it will restart immediatly?
Will it immediatly restart? Does it loose spark?
What engine do you have? Year model? Some models use engine with timing belt. Maybe out of time?
Ok, have you tried a test line from the fuel pumps inlet line, back into the fuel tank filler opening and test drove? Bypassing the tank, suction tube and line to the fuel pump?
Just a test that I like to run, to eliminate any possible fule suction problem.
OK, i still suspect the micro switches, but you say they are new and are working. Let me opt out and see if anyone else will reply. Sorry.