Generator vapor locking
So I've been trying to track down this issue I have been having with my 5500 Cummings/Onan generator. It will die out intermittently. I finally tracked it down to it dies when you hit a very rough hig...
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For those than think fuel pump------There is a set amount of fuel in the Carb fuel bowl. The Pump does NOT supply continous fuel to the carb. There is a Float with a needle jet. The bowl continues to fill and the Needle valve shuts off excess flow. So, if the fuel pump was the issue, that would NOT cause an instantainous killing of the Genset. If the fuel pump was bad , then the Genset would kill at anytime. A "BUMP" would, if anything, cause a Pump to start running not kill it. Also, OIL problem(Switch) and viscosity will yield the Genset starting right back up when it dies. DOES THE GENSET START RIGHT BACK UP AFTER IT DIES? If so, you problem is not fuel supply or Vapor lock. I still state to replace the Oil pressure switch. That is a LOT cheaper than a fuel pump. DO NOT, install a regular automotive similar fuel pump. Those run at a higher PSI than an Onan pump. Doug
