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Old 03-25-2012, 10:15 AM   #1
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Onan 5.5 stops when driving

I have a 2008 Safari Trek 29RBD. Gas tank 3/4 full. In hot weather when driving over a hour the Onan 5.5 KW stops running. Any suggestions on what could be causing this? It runs with out stopping when not moving down the road. Bob
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Old 03-25-2012, 10:21 AM   #2
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If your fuel tank is low it may cause the pick up tube to miss the fuel as you are sloshing around. I think the tube can only pick up fuel with at least 1/3 tank of gas.
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Old 03-25-2012, 10:32 AM   #3
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It sounds like a cooling problem. I would run the gen stopped. Then check the cooling air exaust vent(s) to be sure there is a GOOD air flow and there is no debris blocking those vents. If you can get to the intake, check there also for any restriction.

When driving on a hot day, the air off the road is going to be hotter, so even a small cooling restriction could trgger a hot engine shut down.
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Old 03-25-2012, 11:23 AM   #4
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is it giving you an error code when it shuts down?--it should be..
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Old 03-25-2012, 01:57 PM   #5
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I had a similar problem with mine. At first I thought it was a heat problem but since it would run for hours sitting still in100 degree temps I decided that wasn't the issue.
It was under warranty and an RV dealer replaced the fuel pump. That didn't help and a Cummins dealer replaced the fuel pump again - still didn't help.

Finally a service tech at the Winnebago factory found a loose hose clamp at the transition from rubber fuel line to metal close to the gas tank. He tightened it and it has been running great for 8 years.

The vibration going down the road was letting the genny suck air and die. The error code was "unexpected shut down" or something like that.
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Old 03-25-2012, 09:13 PM   #6
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As strange as it sounds, we had the same problem on our gasser and it would not happen if you kept the gas cap on the motorhome loose. It would run all day if the motorhome engine was not running at the same time.
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Old 03-26-2012, 08:28 AM   #7
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Originally Posted by Stump Jumper View Post
As strange as it sounds, we had the same problem on our gasser and it would not happen if you kept the gas cap on the motorhome loose. It would run all day if the motorhome engine was not running at the same time.
just what I was thinking. I believe your problem is the engine is pulling a vacumn on the tank and starving the gen. for gas.
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