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Onan 4.0 Carburetor


rushjunkie
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Here's what I know:

-The generator this came out of is an Onan 4.0 with only about 100 hours on it.

-The generator sat for about 4 months and then wouldn't start. Ran fine when stored.

-I didn't have time to try and clean this carb before a family trip so I had a new carb installed.

-New carb cost me $500 to install!! scared.gif


Here's what I don't know:

-If this carb will work as new once cleaned. I'm reasonably sure it's just clogged, but I'm not offering any sort of warranty with it.

-If this carb needs to be rebuilt or if it is even possible to rebuild.

-What this thing is worth. Prices on used carbs vary widely, so someone make me an offer.



Here's a couple pics of the carb exactly as it came out of the genny. I haven't sprayed it with cleaner outside (obviously), or inside.

post-3304-0-03541400-1379725977_thumb.jp

post-3304-0-45429900-1379725978_thumb.jp

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My understanding on Onan carbs is they can be rebuilt and re-used. The gas builds up in them and clogs/gums up the insides. I think it takes a little working knowledge of how the carb works and goes together but I know the Local RV dealer keeps a reserve of them because they are always being a problem. Maybe we should have a DDR once a month reminder to start your generators? :director:

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Unless it has changed in the last few years Onan Carbs kits aren't available through Onan. It was always a new carb for me. At that time it was always about $70 dollars for just about any replacement part for an Onan. Now days it probably twice as much. forget the labor, that is sky high!

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Last I checked you cannot rebuild them and a new one ranges from $150 - $200 for a Onan 5.5. They get glogged very easy if they just sit around and are not started. Them charging you $500 to install the carb is insane, it only takes about 20 min to change it and even with the price of the carb is should not be that much.

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They clog up at the fuel inlet where the altitude adjustment needle is. The mixture control solenoid sometimes requires a good spraying of carb cleaner and a whack on the bench. They don't sell rebuilds kits for these, but there really aren't any parts inside a little carb like this. Just pull the float bowl off and clean it out.

I bought one of these carbs once (for a 5500). I believe it was about $180 new through Camping World.

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  • 3 weeks later...

Good luck finding them for the 150$ range I've replaced a handful over the years best price I found was 170$ at Cummings dealer I went in late July and was told price has went up as of June 1 13? To 270$. So please if anyone knows where to find them cheaper currently post it up thanks

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Yeah, I think the carb was close to $300 on its own. Diagnose, labor to install, and tax takes me REAL close to that $500 mark.

I've seen a couple of videos on youtube on how to clean them. I don't think this carb is doomed. I'll put it in a box and ship it out REAL cheap if anyone wants to try and revive it. Might not be a bad idea for me to clean it and keep it as a spare if it works (seeing as how expensive new ones are).

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