Good Sam Club Open Roads Forum: Onan Generaor - 10 yr old
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 > Onan Generaor - 10 yr old

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gbopp

The Keystone State

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Posted: 02/02/18 10:47am Link  |  Quote  |  Print  |  Notify Moderator

TC&Z wrote:

Appreciate your suggestion. Our gen gets its fuel directly from the main MH tank. Unclear to me how you want me to introduce the Seafoam into the generator's fuel line. Please provide a bit more info how to do this, apologize its not obvious to me... thx

You can put the Seafoam in the MH fuel tank, I believe they recommend 1oz Seaform per gallon of gas.
Or, you can rig up a small external tank and gravity feed it to the carburetor.
Another option, which I do, get a can of spray Seafoam and spray it into the carburetor while it's running (remove the air filter). Do that a couple times and then stop the generator and leave it sit for an hour or two. This will obviously not clean the fuel line but, it does a good on the carb.

ScottG

Bothell Wa.

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Posted: 02/02/18 11:23am Link  |  Quote  |  Print  |  Notify Moderator

Sounds like the choke is sticking on. I would clean the area thoroughly with spray carb cleaner.
Can't hurt!


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Farmboy666

Pisgah Forest, NC

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Posted: 02/02/18 12:33pm Link  |  Quote  |  Print  |  Notify Moderator

TC&Z wrote:

Farmboy666 wrote:

It sounds like a fuel issue but 20 seconds really isn't an issue. Does it get fuel from main tank or it's own? Either way I would try some Seafoam first and that should help clean things up if it's fuel system.


Appreciate your suggestion. Our gen gets its fuel directly from the main MH tank. Unclear to me how you want me to introduce the Seafoam into the generator's fuel line. Please provide a bit more info how to do this, apologize its not obvious to me... thx

Mine runs off the main tank and the gas line to the generator has a quick disconnect to the main tank, I unhook it and put it in a gas can and prime. As some have said it may not fix the problem but is an easy and cheap first step.

koda55

Jacksonville, Florida

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Posted: 02/02/18 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

I agree with everyone that has said to use seafoam. I use it in all my gas engines.
Our RV has a 150 gallon tank and I put 3/4 of a gallon in the diesel every 4 months. I run the generator about 1/2 load for about an hour to make sure it gets into the generator.

ArchHoagland

Clovis, CA, USA

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Posted: 02/02/18 06:49pm Link  |  Quote  |  Print  |  Notify Moderator

I use Seafoam once every year. I put 5 to 6 cans in the gas tank just before a long trip.

During that trip I'll run my Onan 5500 for at least an hour.


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roam1

Gulf Breeze FL

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Posted: 02/02/18 07:45pm Link  |  Quote  |  Print  |  Notify Moderator

sounds like the automatic choke to me to, as they get older they can stick and take a bit longer to function.

sehunter

Rancho Murieta, Ca.

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Posted: 02/02/18 10:41pm Link  |  Quote  |  Print  |  Notify Moderator

I agree with Richard my generator was doing the exact same as yours. I visited our local Onan shop and was told they have replaced hundreds of the vacuum chokes on the carburetor, it sounded like there is a service life on these things. If you are able to service your RV you are more than capable at replacing it.


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mcal63775

S.E.MO.

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Posted: 02/11/18 12:43pm Link  |  Quote  |  Print  |  Notify Moderator

Use Seafoam every time you fuel. If you are be able to get premium WITHOUT ETHANOL, that will be a plus. Exercise your rig at highway speed least once a month, running generator. Use the levelers and slides. A sitting rig will deteriorate way faster than one getting used.

Rick Jay

Greater Springfield area, MA

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Posted: 02/11/18 03:19pm Link  |  Quote  |  Print  |  Notify Moderator

TC&Z,

I agree with checking out the choke. But before you do that, is there any possibility the altitude adjustment got bumped when you were working on it? Our Onan has an adjustment for the altitude for which it's being operated. Depending upon the altitudes and/or setting involved, if it's not adjusted properly it might look like a choke problem on start up.

Good Luck,

~Rick

* This post was edited 02/11/18 03:28pm by Rick Jay *


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Passin Thru

N VA

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Posted: 02/11/18 08:04pm Link  |  Quote  |  Print  |  Notify Moderator

If that one has the automatic choke (not sure if its auto or heated intake) the solenoid on the mixture solenoid could be going bad. Pull the plug with 2 wires to it from the float bowl and clean with a carb cleaner and tooth brush, preferably your wife's. They usually cause surging. It's a very easy fix.

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