Community Forums

bsamole · 11-14-2013, 12:04 AM

I have Onan 6.5NHMFA26115H LP generator in my 2000 Itasca Horizon DP.

The generator will only run for seconds before shutting down. If I continue to squirt starting fluid in to the air cleaner it will continue to run.

The problem started with a LP fuel cutoff solenoid that required being hit with a screw driver to turn on. Then it would work fine until the next time.

I replaced the AFC Model 121 cutoff solenoid with a new AFC Model 121. During the replacement I damaged the output hose and small pieces of rubber entered the system.

Since then I have done the following knowing full well that some of the maintenance items have nothing to do with the problem.

Replaced the spark plugs with the same model plug gapped to 25.
Replaced the spark plug wires.
Changed the oil filter with Onan filter.
Changed the oil with Onan oil.
Changed the air filter.
Changed the fuel filter.
Blew out the LP lines.
Rebuilt the regulator with IMPCO RK-J-2 kit.
Replaced the damaged hose with a new hose.

After pulling the generator for the third time I made a 4 foot extension to the liquid LP line and test the generator while on the transmission jack. Using jumper cables for 12V.

I am getting ready to start over with the LP fuel delivery system.

Please help as I am at a loss.

trackman · 11-14-2013, 03:11 AM

The LP regulator could be bad.
Not likely internal on the gen with all you have done

Papa_Jim · 11-14-2013, 08:15 AM

Check the governor to carburetor throttle rod. It can fall out of the governor control arm at the back of the engine. Unfortunately, you can't get at it without removing the generator from the RV and taking the top cover off. I've pulled my generator twice to fix this.

Jim

bsamole · 11-14-2013, 12:54 PM

Actually that exact thing happened the first time I reinstalled the generator. It is fairly easy to dislodge the rod a the governor since it is only attached by a nylon nipple.

bsamole · 11-14-2013, 05:59 PM

Update:
Turned out to be the regulator. Even though I blew out the LP lines and blew out the needle valve some small pieces found their way to the needle valve. I R&R the regulator and everything back to normal. Thanks for your ideas.

Papa_Jim · 11-15-2013, 08:41 AM

Glad to hear it's running again. Sometimes the simplest things cause the greatest problems.

Jim

OnJa · 11-18-2013, 07:04 AM

My Koehler diesel generator last summer was running perfect en-route to SC. We made it from IL to GA and stopped for the night. During the night I was woke up by the 'spuddering sound' of the generator. Like it was running out of fuel. That was not my problem because I had fueled up when I arrived at the TS when we arrived earlier for the night.

I have changed the oil, filter knowing that these can be the culprits with any engine problems.

My generator runs perfectly if I hold the "START" button down, but when released, IT QUITS.

I am at wits end. Please, any ideas.