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Old 11-01-2003, 08:16 AM   #1
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1966 26' Overlander
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Onan stalls

My Onan 4KW started stalling on sharp turns back in the summer.
I installed new spark plugs, and it runs great when sitting still.

It starts easy, and handles a load no problem..but it stalls on the turns, and today stalled after going over a bump. Any ideas on a fix, or what to check? I have cleaned the fuel filter--that littleplastic deal..and the carb. Thanks
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Old 11-01-2003, 08:40 AM   #2
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Fuel level in the carb float bowl, float, needle and seat.

Ignition wiring for a loose connection.


John
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Old 11-01-2003, 06:35 PM   #3
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Onan Problems

The Onan on the 345 started to give me some problems this weekend also.

It ran fine with both AC's on for about a half hour, then surged a couple of times, then flat died.

During the carb rebuild a month or so ago I installed a clear filter just before the Onan fuel pump. The filter body never fills with fuel, I therefore suspect it is pulling air in from someplace -- possibly the old rubber fuel lines are starting to deteriorate.

Also, during the rebuild I noticed that both of the needle adjustments were worn badly (velocity errosion from air being drawn in?). This, coupled with the fact that I could not find a "sweet spot" for either of the needle adjustments leads me to suspect that air is being pulled into the fuel system.

I plan to trouble shoot the system by taking fuel from the pressurized side of the rear electric fuel pump and feeding the Onan fuel pump with this pressurized gas, rather than having the Onan pump pull the gas all of the way from the main tank in the rear of the vehicle.

I'll keep the forum posted on my efforts.
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Old 11-01-2003, 07:16 PM   #4
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Re: Onan Problems

Quote:
Originally posted by 87MH
.... The filter body never fills with fuel, I therefore suspect it is pulling air in from someplace -- possibly the old rubber fuel lines are starting to deteriorate.
.......
Same here with new rubber lines. Those filters don't seem to fill all the way, when used on low volume generators.
But I have no problems with it.
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Old 11-02-2003, 07:29 AM   #5
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I will check/replace those lines. They seem to have been replaced before..but other things on my coach were replaced in a haphazard manner. Like the 4ga line to the alternator that was spliced down to about half that size.
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