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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > How to Install Fuel Pump & Gas Filter for Onan

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kioticoachman

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Posted: 08/26/21 02:50pm Link  |  Quote  |  Print  |  Notify Moderator

Dear Friends .... Would somebody be able to give me some step by step instructions on how to remove and replace the fuel filter & fuel pump on my 4ky Onan Mobile Genset Generator? Model 4ky Fa26100J - S/N
L000188850.

I ordered & now have received the pump & filter for the Unit. Any an all assistance or suggestions would be very much appreciated. Thank you very much! KK - USAF 62-66

bobndot

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Posted: 08/26/21 03:25pm Link  |  Quote  |  Print  |  Notify Moderator

There are many YouTube vids on this. This is just one.

https://www.youtube.com/watch?v=jlrHl0OWSZU

Grit dog

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Posted: 08/26/21 05:14pm Link  |  Quote  |  Print  |  Notify Moderator

Super simple.
Find the existing parts. Likely on left side of engine. Unscrew, un plug, take hoses off. Repeat for install.


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kioticoachman

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Posted: 08/26/21 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

bobndot wrote:

There are many YouTube vids on this. This is just one.

https://www.youtube.com/watch?v=jlrHl0OWSZU


Had a chance to review the Link. It looks like it's the same Generator that he's working on. Very nicely done. This will be my go to! Thanks for taking the time to reply. KK

wra

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Posted: 08/26/21 09:20pm Link  |  Quote  |  Print  |  Notify Moderator

If your Onan is an on board RV unit, make sure the fuel pump for your RV is also working properly, and there is enough fuel in the gas tank. Some Ford chassis had problems pumping gas on a hot day. The fuel pump's fins would flatten out and not pump enough fuel. Not an easy fix, as the pump is inside the RV fuel tank. USAF 65-86. (Onan maint an additional duty in mobile Sq)

Dusty R

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Posted: 08/27/21 06:15am Link  |  Quote  |  Print  |  Notify Moderator

In our Itasca Spirit, you can't get to the right end of the Onan generator as it is mounted. Hope I never have to service the fuel pump and/or filter.

VA-Apraisr

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Posted: 08/27/21 04:09pm Link  |  Quote  |  Print  |  Notify Moderator

Now, that was one GOOD video with step-by-step directions!!! Thanks!

memtb

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Posted: 08/28/21 08:33am Link  |  Quote  |  Print  |  Notify Moderator

The most difficult, time consuming issue with mine was....I had to remove the generator from it’s compartment. I staked some pallets to get the appropriate height, disconnected everything that would prohibit it’s removal, remove cover to access the pump/filter, replace offending parts, reverse procedure to put back into compartment area. Just did this a few weeks ago! memtb


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SJ-Chris

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Posted: 08/28/21 11:25am Link  |  Quote  |  Print  |  Notify Moderator

kioticoachman wrote:

Dear Friends .... Would somebody be able to give me some step by step instructions on how to remove and replace the fuel filter & fuel pump on my 4ky Onan Mobile Genset Generator? Model 4ky Fa26100J - S/N
L000188850.

I ordered & now have received the pump & filter for the Unit. Any an all assistance or suggestions would be very much appreciated. Thank you very much! KK - USAF 62-66


I was recently told by an Onan generator EXPERT (...he rebuilds them and has done dozens or maybe hundreds...) to be careful regarding the fuel pump replacement. He said some non-OEM makers of these fuel pump replacements do NOT have an internal shutoff valve mechanism and can result in situations where fuel can leak (...leak until your tank is at 1/4 full, so it could be a lot). So I suggest you replace yours with an Onan brand fuel pump.

Good luck!
Chris


San Jose, CA
Own two 2015 Thor Majestic 28a Class C RVs

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