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Old 06-20-2015, 08:14 PM   #15
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The problem sort of came back this weekend. Seems the generator just doesn't like to share fuel with the gas engine. About 30 minutes into driving it shuts off and I have to let it cool, prime the line, then it will run again just fine.

Any ideas?

TIA
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Old 06-21-2015, 03:55 PM   #16
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Make sure your oil level is right at the full line. I've had two generators that would shut down if they were below the full line.
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Old 06-21-2015, 08:10 PM   #17
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I checked it today. The level was 3/4 to the full mark but there were some small bubbles around the edges of the "pool". Tomorrow I'm going to drive with the gas cap loose to see how that goes.

Any other ideas?
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Old 06-21-2015, 08:58 PM   #18
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I had the same problem. Replaced fuel line from tank to gen. Problem gone.


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Old 06-21-2015, 11:18 PM   #19
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Your check engine light should come on with a loose gas cap and could cause engine issues, don,t do it.

My generator has 1600 hours on it. I run it while driving, it will occasionally shut off if I hit the brakes too hard. I think it trips the low oil sensor. Mine starts right back. I don't prime it once it is hot.

My fix, don't brake hard.
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Old 06-22-2015, 08:46 AM   #20
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I have posted this before, and maybe my story will be of some use to you. I had to buy a new Microlite 4000 gas generator for my '99 motorhome since the repair cost of the old one was too high. The new genny did the same as yours; shutting down after driving for a while on the road. A Cummins Onan tech in California said many RV manufacturers place the generators too far from the chassis fuel tank, and the little fuel pump can't continue to provide an adequate supply when driving. At his suggestion, I added a small pump to the generator fuel line, and everything has worked flawlessly for the last two years.

Quote:
Originally Posted by Car54 View Post
The problem sort of came back this weekend. Seems the generator just doesn't like to share fuel with the gas engine. About 30 minutes into driving it shuts off and I have to let it cool, prime the line, then it will run again just fine.

Any ideas?

TIA
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Old 06-22-2015, 08:49 PM   #21
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Quote:
Originally Posted by George Schweikle View Post
I have posted this before, and maybe my story will be of some use to you. I had to buy a new Microlite 4000 gas generator for my '99 motorhome since the repair cost of the old one was too high. The new genny did the same as yours; shutting down after driving for a while on the road. A Cummins Onan tech in California said many RV manufacturers place the generators too far from the chassis fuel tank, and the little fuel pump can't continue to provide an adequate supply when driving. At his suggestion, I added a small pump to the generator fuel line, and everything has worked flawlessly for the last two years.

George,

The tank on my F-53 chassis is less than 8' from the generator. Seems like that's pretty close, no?
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Old 06-23-2015, 09:27 AM   #22
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Mine seems to be ok now in 106 deg heat with the RV engine running or stopped. You may just need the "cold air intake" to keep the gen. cooler.
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Old 06-23-2015, 09:31 PM   #23
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Mine seems to be ok now in 106 deg heat with the RV engine running or stopped. You may just need the "cold air intake" to keep the gen. cooler.
Idaho, which mods did you do?
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Old 06-23-2015, 09:53 PM   #24
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I'd like to add something that is overlooked most of the time.

The inclosure of our rv gensets contribute to overheating and vapor lock of our gas fueled engines.

Adding an additional way for cool air to enter the inclosure, ensuring the hot air has no obstructions at the exit, and the addition of a second low pressure fuel pump eliminates premature shutdown issues 99.9% of the time.

We have to be sure our carbs are clean, and the altitude compensation is adjusted properly.

I've also like most of the poster here, learned this by trial and error experience.

DTW
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Old 06-23-2015, 11:18 PM   #25
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Idaho, which mods did you do?
I insulated the fuel line from the carb.10' back.

Vented the gen door w/ shroud. (reducing the overall temperature is key IMO)

Lastly a new updated fuel pump as I think the heat fried the oem pump.
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Old 06-24-2015, 06:51 AM   #26
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Thank you guys for the suggestions. My generator produces a ton of downward air around where the exhaust comes out. Does this thing have a fan in there somewhere? It will brown out grass in less than 20 minutes.
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Old 06-24-2015, 10:13 AM   #27
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Thank you guys for the suggestions. My generator produces a ton of downward air around where the exhaust comes out. Does this thing have a fan in there somewhere? It will brown out grass in less than 20 minutes.
The fan is right next (to the RIGHT) to the fuel pump you installed.
Installing the door vent brings sealed cool air directly to the air intake of the generator forcing hot air out the bottom.
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Old 06-24-2015, 10:45 AM   #28
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The fan is right next (to the RIGHT) to the fuel pump you installed.
Installing the door vent brings sealed cool air directly to the air intake of the generator forcing hot air out the bottom.
I have a 5500 and I think it's a little different. From left to right I have the fuel pump and filter, then the air filter, then carb in the middle, the exhaust comes out of the right and underneath there is a cavity where a rush of hot air comes out. I'd say exhaust leak but it doesn't sound loud. I'm thinking there's a fan that draws air over or I have an after muffler leak. My air intake is a hole on the bottom of the tray.

Thanks again for your continued support.
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