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09-19-2015, 07:51 PM
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#1
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Member
Join Date: Jul 2012
Posts: 80
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Onan 4000 Fuel Filter
Has anyone installed some kind of extension coming off of the fuel pump to make it easier to change the fuel filter?
I changed my fuel filter today and it took quite a while since I had trouble getting it off from the access hole. So I had to get all the way to the fuel pump to unscrew the filter from the pump.
Just looking of thoughts to make this easier.
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2005 Fleetwood Jamboree 31U
2017 Fleetwood Flair 31B
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09-21-2015, 10:02 PM
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#2
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Member
Join Date: Dec 2014
Location: Texas
Posts: 54
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When I changed mine I used a deep socket from outside the generator compartment (11/16 if I remember right). Came right off, and I guess I was just lucky, but I had no real trouble starting the threads of the new one by hand. Some folks replace the filter with a fitting that the fuel hose will clamp onto and then place an in-line filter in the fuel line outside the generator compartment. Lot easier to change.
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Ken and Deanie (with Ralph the cat)
2002 Winnebago Minnie, 331C, Ford E450 chassis
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09-21-2015, 10:47 PM
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#3
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Member
Join Date: Jul 2012
Posts: 80
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I tried using a deep socket and it was working well until it got jammed against other wires and hoses that run right on the side of the fuel line hose.
I though about installing an inline filter. I guess I would just have to change the in line filter more frequently than the one screwed onto the fuel pump?
__________________
2005 Fleetwood Jamboree 31U
2017 Fleetwood Flair 31B
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09-22-2015, 06:00 PM
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#4
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Member
Join Date: Dec 2014
Location: Texas
Posts: 54
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Don't know about having to change the filter more often --- would depend on the effeciency of the in-line filter as compared to the Onan filter (which is also in-line). With a good quality in-line, I would think it shouldn't make a whole lot of difference, but if it does the in-line outside the generator housing would be a heck of a lot easier to change; just loosen two hose clamps, pull the old filter out, and insert the new one.
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Ken and Deanie (with Ralph the cat)
2002 Winnebago Minnie, 331C, Ford E450 chassis
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09-29-2015, 09:36 AM
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#5
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Senior Member
Join Date: Sep 2011
Location: South West Michigan
Posts: 466
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After 3 fuel pumps in 2 years I moved everything outside the generator box . New non Onan inline pump and filter. Much easier mounted on the frame.
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09-29-2015, 05:53 PM
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#6
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Member
Join Date: Jul 2012
Posts: 80
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Mike - after still having some trouble with my generator after the full service I performed a couple weekends ago, I'm still having some trouble. I have a fuel pump on order from Amazon and it should be coming in tomorrow. Im not 100% sure its my pump that is bad but I have run out of ideas. I'm thinking it might be showing signs of it about to quit completely.
How did you determine it was your pump that was the problem?
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09-29-2015, 05:59 PM
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#7
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by RaisingCajun
Mike - after still having some trouble with my generator after the full service I performed a couple weekends ago, I'm still having some trouble. I have a fuel pump on order from Amazon and it should be coming in tomorrow. Im not 100% sure its my pump that is bad but I have run out of ideas. I'm thinking it might be showing signs of it about to quit completely.
How did you determine it was your pump that was the problem?
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The fuel pump inside the Gen gets cooked pretty fast. FW sent me a inline fuel pump that mounts nearer the tank to solve my last gen problem. (I left the oem inline pump)
__________________
2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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10-04-2015, 06:42 AM
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#8
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Member
Join Date: Jul 2012
Posts: 80
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How hard was it to install the fuel pump that FW sent you?
I changed out my fuel pump yesterday. Also installed an additional inline fuel filter outside of the generator box.
Ran the generator without issue for about an hour yesterday. I will be out tailgating next weekend. Hopefully my problem is solved.
__________________
2005 Fleetwood Jamboree 31U
2017 Fleetwood Flair 31B
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10-04-2015, 08:19 AM
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#9
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Senior Member
Join Date: Mar 2013
Location: Boise, Idaho
Posts: 715
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Quote:
Originally Posted by RaisingCajun
How hard was it to install the fuel pump that FW sent you?
I changed out my fuel pump yesterday. Also installed an additional inline fuel filter outside of the generator box.
Ran the generator without issue for about an hour yesterday. I will be out tailgating next weekend. Hopefully my problem is solved.
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The job took about a hour and a half once I had the right parts. I mounted it inline along the frame where the existing 1/4" fuel line was. I bought a spare pump as they are cheap. $40.
__________________
2016 Thor Tuscany 34ST XTE, Freightliner XCR, ISB 360hp/800tq. Allison 3000, Koni FSD shocks, Roadmaster 1.75" front sway bar, Safe-T-Plus, DYI air bag flow control valves.
2015 Jeep Willy's Wheeler Wrangler Unlimited Toad, Ready-Brute-Elite tow system.
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10-04-2015, 08:53 PM
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#10
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Senior Member
Join Date: Aug 2014
Location: Fort Worth, TX
Posts: 242
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Has anyone found a filter that will crossover for the Onan 149-2457 ? I just hate being limited to the Cummings dealer for replacements.
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10-05-2015, 05:29 AM
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#11
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Member
Join Date: Jul 2012
Posts: 80
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You can find that same filter on Amazon. That is where I have purchased all of my parts recently.
Fuel filter, air filter, spark plug, and fuel pump.
__________________
2005 Fleetwood Jamboree 31U
2017 Fleetwood Flair 31B
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10-05-2015, 01:38 PM
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#12
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Junior Member
Join Date: Oct 2015
Posts: 23
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Onan 4000 Fuel Filter
You don't need the same filter or pump I replaced my pump and filter got a low pressure pump and filter at auto zone got a longer gas line and mount it on the outside makes it easier to replace when the pump and filter when it needs to be changed
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10-05-2015, 04:40 PM
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#13
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Member
Join Date: Jul 2012
Posts: 80
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How did you mount your fuel pump?
Only thing I could figure to do is bolt it directly to the outside.
__________________
2005 Fleetwood Jamboree 31U
2017 Fleetwood Flair 31B
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10-05-2015, 08:02 PM
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#14
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Junior Member
Join Date: Oct 2015
Posts: 23
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Onan 4000 Fuel Filter
Mounted on the outside as well and here's a picture and the picture of the two filters ATTACH]108890[/ATTACH] 
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