Ron, itís a very easy job. I think I did mine around 190-200 hours. Carb I replaced two season ago with an after market carb. I change the air filter every year and the oil every season regardless of hours run.
. . . . . Basically, the fuel pump becomes sensitive to hot operating conditions. I wonder why the fuel itself is not enough to keep the pump cool. Anyway, I ordered a new fuel pump and fuel filter (they are removed together) costing me roughly $45 for the pair. I await their arrival. The weather is now much cooler so I'll be changing parts without official confirmation that the problem is solved. According to the videos, changing the fuel pump with the filter seems easy enough. . . . .
Hi JJ,Thanks for that interesting theory.In the case with the Onan, the fuel line enters from a "forward cool" location and the fuel filter and pump are right at the point of entry. I don't think the fuel has enough opportunity to heat up and vaporize within.Given in the past, I have run my generator with a/c running under even hotter conditions without incident, I strongly feel it's my fuel pump. The parts are cheap enough, surely worth replacing them because of my suspicion.
A negative fuel supply line pressure(more than minus 1.3 psi or three feet of lift) will prevent the pump from delivering enough fuel. Measure the pressure at the pump inlet. Inlet pumppressure must be between a minus 1.3 psi and apositive 1.5 psi (minus 8.3 kPa and positive 10.3kPa).
Hi Volkemon,My generator ran for multiple hours with the a/c unit on, but only after the worst heat of the day had passed.