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Old 07-17-2011, 06:52 PM   #1
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Onan Generator Fuel Filter(s)

My generator won't start, and the fuel line appears to be blocked up-stream, between the generator and the tank. It seems like someone here mentioned that some (maybe all) Onan generators have two fuel filters. If so, where is the other one? The one on the carburator is downstream from the problem, and it checked out o.k., anyhow.

Thanks in advance,

Hack
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Old 07-17-2011, 10:39 PM   #2
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What make of coach do you have? I know that Tiffin used to install a second fuel filter between the tank and the generator, but that was on older coaches. They have since removed that filter from new rigs.
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Old 07-18-2011, 03:30 AM   #3
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Quote:
Originally Posted by ehhackney View Post
My generator won't start, and the fuel line appears to be blocked up-stream, between the generator and the tank. It seems like someone here mentioned that some (maybe all) Onan generators have two fuel filters. If so, where is the other one? The one on the carburator is downstream from the problem, and it checked out o.k., anyhow.

Thanks in advance,

Hack
--//--
my genny is a 5500 marquis.
My other fuel filter is under the genny where the fuel line comes through the bulkhead. so is the electric fuel pump. both filters are the same part number, 48-2014. i had to cut the original clamps off.
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Old 07-18-2011, 01:33 PM   #4
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You may already know this but sometimes it's the simpilist things. Is there greater than 1/4 tank of gas? Generator fuel pickup tube does not go to the bottom of the tank in order to avoid running your tank completly dry.

Dave
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Old 07-18-2011, 01:47 PM   #5
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I had a similar problem on my Allegro (1998) Onan 4Kw generator. I found it to be my generator fuel pump that was the culprit. Try disconnecting the fuel line between the fuel pump to the carburator and try to start the genny to see if fuel is being pumped from the gas tank.
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Old 07-18-2011, 07:54 PM   #6
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I have a 2005 GulfStream SunVoyager on a W22 chassis. I was experiencing a condition where the generator would start running all raggedly and then shut off for no reason.

Code 36 I think it was on the generator. Shut off from some mechanical reason.

I cracked the carb bowl drain on the generator while it was running and a good fuel volume came out. I left the generator run and when I heard it start to run ragged I zipped out to the generator and tried the bowl drain again. Almost no fuel came out.

I pushed the prime button with the bowl drain open and again no fuel came out. I put my hand on the pump and no vibrations, hum, buzz... anything. I suspected the fuel pump was the problem.

I did a search and found a forum entry where a gent said he replaced an Onan fuel pump with a low pressure unit from Autozone 2.5-4psi. I check the local store and they had one. I have found the Onan pump online for $107. Price from Autozone was $53 with a discount code I also found online.

Here is a picture of the 2 units I took last night while I was changing the pump out. If I didnt know any better I would say they were made by the same manufacturer. I needed a 90* angle adapter and had to trim the handcuff bracket that holds the new pump.

I understand these pumps are routinely a problem. I was sure I did not have a fuel line problem when I unhooked the pump and fuel came ROLLING out the fuel like coming from the tank.

Hope this helps!
Chris
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Old 07-18-2011, 08:49 PM   #7
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Grrrrrrrrrr, cant get the pic to load....

Part number Airtex E8016S

Post or PM me an email addy if your curious and I will send you the picture if you need to see it.

Autorotica@aol.com is my email addy.

Chris
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Old 07-19-2011, 09:29 AM   #8
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I don't know when Onan switched from two filters to one but my 2004 (5HGJAB) had two.
They now sell an adapter that replaces the one at the carburetor and there is a new filter that replaces the old one. I was told they no longer manufacture the old one but I haven't verified that.

1) Fuel filter new style)(1) - #149-2341-01 ($12.10)

2) Adapter, Fuel Line *(1) - #A026E529 ($18.06)
permanently replaces the upper fuel filter
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