Goes on for 3 min than shuts off, fault light goes on
SOURCE: kohler 12kw generator starts but shuts down after 3sec
Your gas pressure is too low and you may not have a large enough supply pipe. You need at least 10 inches of water column with the engine running to operate an LP vapor fueled engine. Because the engine is starving for fuel, its governor opens the throttle to WOT (so it goes to high revs) but there isn't any fuel to make horsepower with so the output voltage falls and the undervoltage alarm trips.
Carl
SOURCE: I have Kohler 12Res generator,sometimes
If it has a couple hundred hours or more, try cleaning the slips rings on the back of the rotor shaft. They should be very shiny and not black or polished looking.
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