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Re: Onan issue [message #366784 is a reply to message #366780] Tue, 14 September 2021 19:43 Go to previous messageGo to previous message
Larry is currently offline  Larry   United States
Messages: 2875
Registered: January 2004
Location: Menomonie, WI
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Senior Member
lqqkatjon wrote on Tue, 14 September 2021 17:59
Board was a few years ago.

Last weekend test showed good voltage at coil. As well as timing light flashing away. Also ran jumper to coil from battery and it still died.

Today hooked up pin9 to 5. Ran it and it died same way.

Again seems there is fuel. This is like the 4-5th carb rebuild and 3rd carb. This carb was sent down and rebuilt by jeff sirum. And he said he ran it on an onan and it worked fine.

I think it might be flooding itself out??? But i dont think the spark plugs really look wet.

Trying to hold open carb butterfly does not let it really restart. You just have to walk away for 5-10 minutes and it will start up and run again.


I am thinking of holding a contest and offering $$ reward to anybody at gmcmi who can get this bugger to run for over an hour straight.


I stood next to that thing and watched it while it slowly died. My gut feeling from observing and smelling the exhaust is that it is a fuel problem. If the carb ran good on another Onan, look up the line. Fuel pump? It is electric and could be failing as it heats up. Fuel line collapsing? Pick-up in the tank plugged? Just seemed fuel to me, and considering you saw the timing light flashing as it quit....kinda illuminates spark. JWIT


Larry Smile
78 Royale w/500 Caddy
Menomonie, WI.

[Updated on: Tue, 14 September 2021 19:44]

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