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Old 07-06-2012, 02:57 AM   #1
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Weird generator issue

My onan 4000 was running fine under way, but as soon as I turned off the coach engine it died and would not restart. I have no idea what the problem could be. It acts as if it's not getting fuel, if I hold the prime for a few seconds it will fire, but only for a second and dead again. I have 8 people on board and we are boon docking for the night. It's hot but we will be on shore power tomorrow. I'm mechanical and can fix it, just need advice on where to start looking.

Thanks in advance,
Justin
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Old 07-06-2012, 03:25 AM   #2
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is the tank above 1/4? Always the first thing I check, generator fuel pick up tube stops at about a quarter tank to keep the generator from running the coach dry.
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Old 07-06-2012, 07:13 AM   #3
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I'm sorry for not specifying that. Yes, I have a little more than half a tank.
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Old 07-06-2012, 07:52 AM   #4
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You also have an oil level switch, make sure it's filled to the correct level. Just a thought. Jim
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Old 07-06-2012, 08:10 AM   #5
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The oil on the dipstick is between full and add, I can see the oil in the fill tube. Should I bypass the oil switch and try again?
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Old 07-06-2012, 08:49 AM   #6
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That would be a good place to start.
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Old 07-06-2012, 10:19 AM   #7
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Any chance it's running hot? If you get it running a bit, make sure there is a good air flow coming out the cooling air exaust. These things can pick up debris, but mice nests are the major problem.

Gennys needs a 12vdc sourse for the control system. So when you said it died when you shut the engine off, this leads me to think you may have a low voltage problem in the coach. Probably just a coincidence, but trying with engine off, then again after it running 5 mins or so will tell a lot.
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Old 07-06-2012, 11:38 AM   #8
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I was looking at it while my friend was pumping gas and when the tank was full gas started spraying from under the gen. The fuel line had a split where it connected. Cut out bad line and it fired right up! Now I have to readjust back for altitude since I messed with that, but we are on the road with a/c!

Thanks for the help all!
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Old 07-06-2012, 11:43 AM   #9
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How old is your RV?. There have been lots of comments about generators running bad and the problem is resolved by replacing the entire fuel line from the main tank. if you had a split in one place, it's likely there is another one waiting to occur...

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I was looking at it while my friend was pumping gas and when the tank was full gas started spraying from under the gen. The fuel line had a split where it connected. Cut out bad line and it fired right up! Now I have to readjust back for altitude since I messed with that, but we are on the road with a/c!

Thanks for the help all!
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