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Old 06-15-2015, 07:02 PM   #1
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Running Generator on the Road issue.

I can run my generator and the coach air conditioners for hours with no issue.
Once on the road the generator will stop and sometimes fail to restart, until I stop at a rest stop, then it starts and runs fine until I start moving and after an hour or so stops running..... repeat scenario ....

Any ideas ? The unit was just serviced after 100 hours of operation...
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Old 06-15-2015, 07:23 PM   #2
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sounds like it could be a fuel pickup issue. More info on the MH and the genset would help clarify some things
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Old 06-15-2015, 07:56 PM   #3
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What was the outside temperature?

My Onan 5500 will shut off when it get hot outside, about 95 degrees and up depending on air flow etc.

The heat from the engine gets pulled into mine too and that affects it.

RV Make and Model along with generator info will help. People with similar RV's may have a better idea of what the problem may be.
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Old 06-16-2015, 06:59 AM   #4
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Sorry for the delay, traveling with poor wifi access...
It is one of these so I assume since I need 50amp service it is RV 65 ..
RV-45, 55, or 65 ...

Am I correct in assuming the Generator should be cooler when the rv is moving?
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Old 06-16-2015, 07:22 AM   #5
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Zac,
those numbers don't compute but if you were to open the access door or use some other way to see the numbers on the side, we may just be able to steer you in the right direction.

Also the coach information as in diesel/gas name brand and year would be helpful. This will help us help you pull from the combined years of experience you'll find on this forum.

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Old 06-16-2015, 07:35 AM   #6
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maybe post a pic of your setup like ours:
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Old 06-16-2015, 07:42 AM   #7
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I would ask if you checked the control switch on the generator itself if it's an Onan diesel, except, we don't know you RV make, model, year, or if the gen is gas, propane or diesel.

If it's an Onan diesel and it shut down like that it will have a fault code. Momentarily push the stop side of the switch and read the code. It will have two parts. The first will be either one, two or three flashes. Then push the stop side again and get the second half, it will probably be two numbers.

Two weeks ago mine shut down with a 3-xx (I forget the number) but I had a can't see coolant temp 5 minute shut down. I had a bad temp senser.

More info we'll be helpful for us to help you.
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Old 06-16-2015, 07:44 AM   #8
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Are there any trouble codes? Your start button on the generator may be flashing the trouble codes. Check your manual on how to interpret them. Mine was shutting down when running for a short time. Replaced thermostat and temp sensor.
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Old 06-16-2015, 08:28 AM   #9
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Right after buying a new generator for our Trek, it began shutting down while running it on the road. A Cummins Onan tech in Sacremento claimed that motorhome manufacturers install the generators too far from the main fuel tank to run without an auxiliary fuel pump. I installed a small low pressure pump 2 years ago, and the generator has worked since then without any stopping incidents.

Others may claim an auxiliary pump isn't needed, but it completely solved my problem
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Old 06-16-2015, 01:03 PM   #10
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Things to check.
Do you have over 1/4 tank of fuel? Pick up tube will not allow you to run generator below that level.

Check oil level. Low oil pressure will cause a shut down.

Check gen coolant level. Low coolant or overheating will cause a shutdown.

Personally to me it sounds like a fuel pickup issue since it runs fine standing still. I had to extend the pickup tube in my tank as it would shut down on the road at half a tank.
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Old 06-16-2015, 01:49 PM   #11
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Quote:
Originally Posted by bdpreece View Post
Things to check.
Do you have over 1/4 tank of fuel? Pick up tube will not allow you to run generator below that level.

Check oil level. Low oil pressure will cause a shut down.

Check gen coolant level. Low coolant or overheating will cause a shutdown.

Personally to me it sounds like a fuel pickup issue since it runs fine standing still. I had to extend the pickup tube in my tank as it would shut down on the road at half a tank.
I agree. This past week end I had the Geni shut down. Checked oil it was low and shortly after that shut down again. RV was parked fuel away from pick up.
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Old 06-16-2015, 07:39 PM   #12
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It is a gas powered coach and generator. Fuel tank is above 1/2 empty.
The models came from the manual with the coach. I'll check the unit in the morning for oil level and coolant level while the unit is cold. I'll try to get more information tomorrow.
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Old 06-16-2015, 09:29 PM   #13
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When it fails to start, immediately pull the fuel line and try to prime it.
Is this perhaps related to warmer temperatures? The inlet temperature when you're running down the road is actually pretty high - road gets hot and you're also sucking down heat from the motor. I suspect you're vapor locking. Had something similar happen to me and it got so bad that I eventually ran a generator on a trailer rack just to get me home in the TX heat.
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Old 06-17-2015, 07:32 PM   #14
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Generator looks to be air cooled to me.. Oil level is at 3/4 up from the add oil line to the full line. I'll get the model number from the unit when it stops raining here... The unit is in the 2nd bay from the back of the bus so it's pretty close to the fuel tank..
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