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Working on a generator with a Honda GX340 11 HP engine. Has not run since 2011.
It starts & runs fine for about 20 minutes, then surges & shuts off. I have:
put new gas in tank - cleaned spark plug & gapped - removed carb & cleaned in solvent -
blowed fuel line to tank - fuel filter open - new battery. Starts & runs good for 30 minutes.
Then acts like key is shut off & on several times before stopping. Thought it could be
low oil sensor. Changed oil & started up. Run OK for 2 hrs 10 mins. before I shut it off.
Started later & run OK for 2 1/2 hrs. Next day I started it & it ran 30 mins. before stopping.
I disconnected low oil wire. Started & ran 20 mins. before surging & shutting off. Fuel filter had gas in when it stopped. When it stops it can be started up right away. Any suggestions ?
Thanks..
 

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You could try a fuel tank clean, to make sure there is no debris in there, also check the tank vent is clear to breath, maybe replace the fuel lines, they may have deteriorated.
 
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