Community Forums

Lakeman1 · 05-29-2023, 05:43 PM

Does anyone have the part number for the fuel filter on an Onan Marquis Gold 5500 gen, it's in a 2004 Pace Arrow? It hasn't been run in a while (two years) and is back firing and struggling under a load, in fact it won't take a load. It did have about a third of a tank of really old gas. I filled it with high test and added four cans of Sea Foam into it (the tank is 75 gallons). Has been driven about a hundred miles. My first thought is the fuel filter. Thanks in advance for your help.

Iceclimber · 05-29-2023, 06:17 PM

https://www.google.com/search?q=onan...t=gws-wiz-serp

spierce617 · 05-29-2023, 06:52 PM

Here is a link to a tune up and oil change kit I got from Amazon. It has all the part numbers for the filters and plugs.

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Onan Air Filter PN: 140-3116
Onan Fuel Filter PN: 149-2341-01
Onan Oil Filter PN: 122-0836
Onan Spark Plugs (QTY:2) PN: 167-1638
GPS Spark Plug Gap Tool PN: 627-0560
GPS Oil Filter Wrench

UFO Pilot · 05-29-2023, 07:03 PM

If yours hasn't been updated there are 2 filters. The one at the top gets replaced by a fitting only and the bottom one is the only 1 left. I bought mine as a kit and I can't seem to find the kit part number.

donr103 · 05-29-2023, 07:52 PM

How many hours..? Carb needs cleaning... if you want to learn how.. with out taking it apart or off generator.. read my old post ..
Good luck and keep us posted

Lakeman1 · 06-01-2023, 08:19 PM

Well I've been too busy to do anything with the Gen. I did get a filter but haven't installed it yet. To answer some of the questions. The gen has 290 hours on it, had the carb replaced maybe 40 hours ago. It has sat for a couple years. It cranks and idles fine but will not run with a load on it. Thanks to everyone for your help.

donr103 · 06-02-2023, 11:19 AM

Take a strong flashlight and look at armature slip rings.. they need to be nice and shiny .. you tube flight system gen repair.. they explain why and how..
Good luck and keep us posted

Triple HHH · 06-02-2023, 12:34 PM

Another item that will contribute to this behaviour is the generator fuel pump. I did a complete tune up on my Onan generator and ended up replacing the fuel pump as well. Keep in mind, there are many fuel pumps available out there, especially on Amazon. These off brand units are enticing to many folks out there because of the cheap price. However, they do not last long and not created equal at all. As a result, I purchased some Onan brand tune up parts and fuel pump from Yakima Generator and other Onan brand tune up parts from RV Upgrades. Just be sure to match the fuel pump model number from your old one to the new Onan model as there have been revisions. Yakima Generator has a good online site that makes the process easy. They are also easy to get on the phone and very helpful.