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Old 08-01-2021, 08:32 AM   #1
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Generator Question

Iíve got an Onan Marquis Gold 7000 gas generator in my mh. It has been running like a champ! The other day I was getting gas and at this particular station the front of the mh was down hill and the rear was higher than normal. Where you put gas in was about head high. Finished topping off the tank and pulled forward with the rear still up high. I started the generator and when the ac kicked on it started to stumble and quit. Pulled up further to a more level spot and she started up and ran fine.

Drove the 50 miles home and started to back into the drive way and the generator started to stumble again but didnít quit. The ac was running. I live on a hill thatís maybe a 5 or 6% grade. The front end was down hill. Got backed into the drive and the generator was running fine.

Sorry for the wordiness to get to my question. The question is why would the generator stumble in these two instances and run fine otherwise? The common thread here is that in both cases the rear was higher than the front. My gas tank was completely full the first time and I would have burned only 6 or 7 gallons before it stumbled the second time.
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Old 08-01-2021, 08:42 AM   #2
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Have you checked the oil level? Perhaps if it was a bit low, then when on grade the oil pressure becomes low enough to shut off the generator (or tries to but has pulsating pressure). My other thought would be the carb fuel bowl float level allowing for a slight flooding issue when on grade. (just thoughts) ~CA
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Old 08-01-2021, 08:55 AM   #3
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Too much oil in the crankcase can cause the engine to stumble while ingesting excess oil blown off via the breather tube. But then you would see smoke.
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Old 08-01-2021, 07:30 PM   #4
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Thanks for the responses. Oil level looks good and no smoke that I’ve seen.
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Old 08-01-2021, 09:30 PM   #5
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Sounds like a weak fuel pump. They are inexpensive. Might as well change the filter while you are down there.
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Old 08-02-2021, 08:28 AM   #6
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Quote:
Originally Posted by Elwood58 View Post
Sounds like a weak fuel pump. They are inexpensive. Might as well change the filter while you are down there.
I agree completely with the fuel pump, having to fight gravity with a weak fuel pump could impact performance. Also check the fuel filter it could also contribute to your symptoms if it is dirty.
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Old 08-02-2021, 09:06 AM   #7
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Lots of good suggestions above!

If the gas tank was down hill from the generator, it may be weak fuel pump or plugged filter.

If the gas tank was up hill from the generator, it could be a carb float valve leaking or a float taking on liquid.
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Old 08-03-2021, 05:44 PM   #8
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If you replace fuel pump... go ahead and replace the fuel lines to.. the alcohol from new gas eats at fuel line.. so save yourself a future head ache.. also inspect old line for fine cracks.. then if new fuel pump and filter does not work.. you need to know.. that on most rv the hard fuel transfers to rubber hose on top of tank.. and time and critters love tasty wires and lines.. and eat the tiniest holes that will leak air into fuel line and act just like you say.. so disconnect fuel line at gen.. use all safety precautions.. and see if pumps fuel into container.. but if you have not replaced fuel pump you are due.. if you are still experiencing problems get back to us for next steps...good luck and let us know what you did and maybe better members then me will help you
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