The dreaded code 36
Onan Marquis Gold 5500 runs for 3 to 10 minutes then surges and dies. Code 36 means it shut down without being told to. Plenty of clean fuel, just changed fuel filter, pump primes, clean air filter,...
Forum Discussion
As others have said it is probably the fuel pump. One other easy test is disconnect the fuel line coming to the pump, install a short fuel line from the pump inlet to a gas can. You only need 3 feet or so of fuel line. If it continues to run with no symptoms, you may have a cracked fuel line coming from the gas tank. I chased this same issue on my 2000 Onan 5500 for several weeks before finding the cracked fuel line. It always seemed to be worse in hot weather and I thought I was having a vapor lock issue.
Not expensive or very hard to run the new line. Mine had a couple of metal sections on the run and I replaced all of the line including the metal with new rubber fuel hose. I tried just replacing the rubber sections and it would still quit running. I have not had any issues since.
Not expensive or very hard to run the new line. Mine had a couple of metal sections on the run and I replaced all of the line including the metal with new rubber fuel hose. I tried just replacing the rubber sections and it would still quit running. I have not had any issues since.
