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Old 04-18-2024, 11:50 AM   #1
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Help with Onan LK Generator

I have an Onan 2.5 LK 6000J from my 1977 Minnie Winnie. It was running when left parked a couple years ago. All the LP lines were stolen. During towing the generator base collapsed and the generator dropped and hung by the battery cable. Took some minor damage. I have it out, cleaned, obvious damage repaired, new plug and oil and turning over with remote start. I have fire on the plug.

Without the original LP lines I'm having no luck getting it to crank. There's nothing but the inlet at the regulator under the carb, which runs through a filter and then into the carb. There was also an electric fuel pump mounted on the frame base, also missing all lines. Using a standard LP bottle regulator connected to the inlet at the engine regulator I'm not getting any flow. Those appear to put out 1 PSI. According to the manual it only operates between 2 and 4 oz which translates to .25-.5 PSI (If my research is correct).
Any advice on getting it connected long enough to crank and verify operation?

Also at some point over the last many years, one of the previous owners has messed with the control box and the connection to the RV Electrical. I think they rewired all the outlets and removed what was probably an outlet on the control box. I cleaned that up. But there are 2 white wires coming out of the generator assembly along with the large wire. Only 1 had a wire nut on it, I think the other one came out of the wire nut when it fell. With those connected together it locks up and won't turn over, so I'm suspecting those are the "engage" switch and of course the thing doesn't have enough torque to turn over with it engaged. I don't have schematics for it just the parts manual so I can't tell. Would appreciate if someone could tell me what that actually is and what it was originally connected to.

TIA!
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Old 04-19-2024, 06:54 AM   #2
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https://www.smokstak.com
https://www.google.com/url?sa=t&rct=...e&opi=89978449
smokstak and cummins have your manual, you have an electric fuel pump? your generator runs on gasoline not lp
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Old 04-19-2024, 07:18 AM   #3
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I too would suggest the Smokstak board for expertise on vintage Onan generators
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Old 04-19-2024, 07:41 AM   #4
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Here's the LK service manual:

https://www.twinslan.net/~n0nas/manu...0(07-1986).pdf

Not a lot of detail on the models that use gaseous fuel but I agree with above that, if there's a fuel pump, then it very likely setup to run on liquid gasoline fuel. It's also possible that it has been converted sometime in the past to run on one or the other or even dual fuel capability.
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Old 04-20-2024, 06:10 PM   #5
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Well that makes perfect sense. I did get it to run enough to prove it would so it's moving on to a buyer soon I hope. At least now I know it's gas not LP and the idiot just stole the gas lines which is an easy replacement
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