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Old 07-16-2013, 07:05 PM   #43
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Originally Posted by 2008 Bounder View Post
Well I have the same problem with my Onan 5500 Gold, if I try to run the generator at any temperaature above 90 degrees it quits and give a code 3-36! I change the oil and filter every season, this year I put 30 weight because the guide says to use it for temps over 32 and above. This has been a problem since new (Nov '07) and the dealer replaced the rear AC unit stating it had a dead short (but the unit worked on shore power just fine!) I take it to the dealer and they run it and it works fine at cooler temps!
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Old 07-21-2013, 09:17 PM   #44
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Originally Posted by LeeSoCal View Post
I have an Onan Marquis 5500 RV generator. It will run for ever if the weather is not hot. When the temp is around 90 degrees the gen will start and then quit. It will not restart. sometimes it will run a few minutes and sometimes it will not start, especially if the ambient temp is about 90 degrees or so. I have checked the fuel filters by removing them and blowing through them. I have also taken the fuel hose off the carb and then pushed the prime switch. The fuel flows great. A full stream at the carb. I think my problem is connected to the electronics some how since it is temp sensitive. When it quits, it just quits like you shut off the ignition. It does not slobber as it slows down. Can you give me your best guest as to what is wrong?
Here's my latest.m My 5500 is mounted about 12" from the ground so all the exhaust heat from the gen goes right back into the unit. I wrapped the exhaust system with a heavy type of insulating tape and I extended the tail pipe so it will clear in air inlet for the cooling. They use it on hot rod exhaust headers. Then I completely bypassed the fuel system that the generator has. I have a 20 gallon remote fuel tank. I mounted a small electric fuel pump with an on/off switch inside the RV, a regulator (set at 3 psi) an inline fuel filter. I disconnected all onans stuff: The electric fuel pump that they mount inside the unit which gets really hot. All their fuel lines and fuel filter. I replaced with barbed ends and good fuel grade rubber hose. I live in Fresno, CA. Today it was 104 and I ran it for a few hours.....no problems;;yet. It is always when we are 1,000 mile away from home that it goes south. I'll keep you posted.
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