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Old 05-29-2012, 02:05 PM   #1
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Generater shuts off when engine is running

My generater runs fine when the engine is not running, but will only run for about 10 min if I start the engine. Where do I start in trying to solve this problem. This is on a National coach, but put in general section to get more coverage, but may be a National problem.
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Old 05-29-2012, 03:03 PM   #2
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Just a guess but my though is that when your main engine is running the generator engine is starving for fuel. You might try replacing the fuel filter.
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Old 05-29-2012, 03:10 PM   #3
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Just a guess but my though is that when your main engine is running the generator engine is starving for fuel. You might try replacing the fuel filter.
That was my first thought too... at least make sure you have >1/2 tank of fuel since gennys often shut down when fuel levels get below a certain point.

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Old 05-29-2012, 03:19 PM   #4
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Originally Posted by wagon217 View Post
Just a guess but my though is that when your main engine is running the generator engine is starving for fuel. You might try replacing the fuel filter.
Our gen set feeds from a separate intake in the fuel tank and also has a separate fuel filter than the main engine.
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Old 05-29-2012, 04:00 PM   #5
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What year National, model, gas or diesel, chassis mfg, onan or generac?
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Old 05-29-2012, 04:24 PM   #6
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Glenn-

I recently changed TWO fuel filters on my Onan generator. Here is the thread on that project. The second filter was eliminated.

Hope it helps you- It was not a big deal.
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Old 05-29-2012, 05:49 PM   #7
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Might be a restricion in the vent line, try removing the fuel cap. If that helps you will know where to look.
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Old 05-31-2012, 12:11 PM   #8
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Onan Genny was serviced and filters and plugs replaced. That was after I noticed it shutting down, but before I realised it happened only with the engine running. I was wondering about the 8.1 pulling a vacume on the tank that the genny fuel pump couldn't overcome. Will have to try running with the gas cap off. May be awhile before I get arounf to that. Thanks for the replys.
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Old 06-09-2012, 10:35 PM   #9
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I also discovered a similar problem with my 2002 Monaco Windsor which has a 7.5KW Onan.

I found that if I have the Cummins engine running and started the generator with any of the rocker manual switches the genny would only run for a few minutes and then automatically turn off. However, if I start the generator with the manual start button on the Trace RC7-GS panel, it would run forever until I shut it down using any of the switches available.

The only explanation I could come up with was that since I have the Trace RC7-GS programmed to turn the generator off when the batteries obtain Float Charge Status, I think the RC7-GS was turning my generator off automatically except for when I started the generator with the RC7-GS panel switch.

Photo of RC7-GS panel attached.

Dr4Film ----- Richard
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