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Old 09-03-2018, 02:53 PM   #1
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Gasoline 4000 Generator problem

My wife drove the camper to my brothers to spend the night. I cranked the generator that night and didnít realize she had not fill motorhome up with gas. Well during the night the gen died. Fuel tank was down to just over a 1/4 tank. Pretty sure this is the shutoff level.

Well now I filled the motorhome full. Tried cranking gen and it floods. Tried changing the spark plug. It sparks great before screwing it in. But when you try to crank gen it back fires but will not start. Pull the plug and itís covered with gas. Tried spraying carb cleaner in the carb. Also disconnected the fuel line and sprayed cleaner in the carb that way while drain was open on the bottom of carb. Guess if no one has a clue what else to try Iíll be looking for an Onan mechanic.
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Old 09-03-2018, 03:17 PM   #2
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Disconnect the fuel line and mix up some gas with the seafoam and run it with that fuel . should stop the float from sticking open.
And clean the jet
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Old 09-03-2018, 03:59 PM   #3
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Carb cleaner

Tried that with carb cleaner. Guess it would not hurt to try sea foam.
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Old 09-03-2018, 05:02 PM   #4
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I had backfiring in mine and took it in to an authorized Onan center under warranty. He checked fuel pump and pressure was too high. Replaced fuel pump and filter.
Dangerous if backfiring as it can cause air filter to catch fire if soaked with gas. Be careful gasoline can be explosive.!

Maybe clamp fuel line before filter and try starting to burn up flooding and then release clamp. I thought the float was stuck,used carb cleaner and Seafoam, but it was the fuel pump.

I would take it in to service center.
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Old 09-04-2018, 02:18 PM   #5
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So it’s giving a code 14. Call repair shop. Guess I’ll be getting a new carb from what I have read online.
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Old 09-04-2018, 03:14 PM   #6
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On my 2016 Class A coachmen my GEN was always hard to start for the first year. Then sometimes during the second year it would not start at all. I didn't use it much but had tried to start it once a month. I had experience this problem on other gas engines and had fixed them by removing and cleaning the Carberator. So I removed the carberator on the GEN(not easy to do) and cleaned and reinstalled as I had on lawn mowers. Works like it was intended too. Primed it good and it starts right up.

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Old 09-04-2018, 07:06 PM   #7
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Stuck float

Old school remedy for stuck floats was to tap the carb by the float chamber.
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Old 09-04-2018, 07:07 PM   #8
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Quote:
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Old school remedy for stuck floats was to tap the carb by the float chamber.
Good idea
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Old 09-05-2018, 08:40 AM   #9
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ONAN 4000 Carbs & Fuel Pumps seem to by quite weak !!!
We had our Carb replace last Spring and then the Fuel Pump in the Fall !!!
Was not exercising properly until last Spring,,, not sure why Pump died ???
Total around $800 + the two trips to service center,,, even though we had an appoint it took about 4 hrs to replace the Fuel Pump !!!
B S !!!
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Old 09-05-2018, 10:37 AM   #10
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I took the carb off. Took it apart and sprayed it out with carb cleaner. Still the same problem. Have fire at spark plug and engine floods. Guess it’s to the shop. Hate spending money on something we hardly ever use.
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Old 09-05-2018, 10:40 AM   #11
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Thioght about ordering a new carb and changing it out my self. Only takes a few minutes to remove it. An after market one is about $150 and one from Onan is about $300.
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Old 09-06-2018, 06:34 AM   #12
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I took the carb off. Took it apart and sprayed it out with carb cleaner. Still the same problem. Have fire at spark plug and engine floods. Guess itís to the shop. Hate spending money on something we hardly ever use.
From what I have been told,,, cleaning is not enough,,,
Ethanol has probably destroyed the carb ???

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Old 09-06-2018, 07:00 AM   #13
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Did you look closely at the float needle valve? A tiny piece of debris sucked in as it was running out of gas could have stuck in the needle valve and holding it open enough to flood the carb.
Do you have a gas shut off? Try shutting off the gas and see if you can coax it to start.
If you don't already have an inline fuel filter and gas shut off they would be fairly easy and cheap to install.


Back in the old days it was possible for a float (plastic or brass) to leak and get gas inside it. That would mimic your symptoms. Even old school floats that were solid foam could become saturated with gas and not float...


$150 for a new carb sounds cheaper than a service call if you want to try that route.

Good luck!
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Old 09-06-2018, 07:14 AM   #14
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Quote:
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Did you look closely at the float needle valve? A tiny piece of debris sucked in as it was running out of gas could have stuck in the needle valve and holding it open enough to flood the carb.
Do you have a gas shut off? Try shutting off the gas and see if you can coax it to start.
If you don't already have an inline fuel filter and gas shut off they would be fairly easy and cheap to install.


Back in the old days it was possible for a float (plastic or brass) to leak and get gas inside it. That would mimic your symptoms. Even old school floats that were solid foam could become saturated with gas and not float...


$150 for a new carb sounds cheaper than a service call if you want to try that route.

Good luck!
The ONAN 4000 has an inline filter next to the fuel pump !!!

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Old 09-10-2018, 08:02 PM   #15
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Generator back running. Onan machanic found the clip holding intake valve had come off. He figures it was not put on right from factory. $100 and he changed the oil for me.
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Old 09-11-2018, 11:50 AM   #16
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Thanks for coming back and letting us know what the problem was.

It was a funny coincidence that it decided to quit just when you were at 1/4 tank of fuel!
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Old 09-11-2018, 12:07 PM   #17
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From what I have been told,,, cleaning is not enough,,,

Ethanol has probably destroyed the carb ???





True dat...
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Old 09-11-2018, 12:40 PM   #18
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Yes

Quote:
Originally Posted by Bama Rambler View Post
Thanks for coming back and letting us know what the problem was.

It was a funny coincidence that it decided to quit just when you were at 1/4 tank of fuel!
The tank was at 3/8. But no clue. He put the clip back in place and it cranks right up and runs fine.
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Old 09-11-2018, 03:55 PM   #19
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Old 09-11-2018, 04:08 PM   #20
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............ hmm. Anyway, hunnerd bucks to get it up and running sounds like a deal, whatever was done.
Intake valve clip?Click image for larger version

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