Onan 5500 Generator is the best in the market.

The Onan 5500 generator quite possibly could be the best in the market.Today’s world lends to a more technologically-savvy Recreational Vehicle owner and it’s not unusual for the modern-day tourist to desire the use of electronics on their RV holiday. For over 80 years Cummins has been setting the standard for quiet, reputable and innovative Recreational Vehicle power.

The Cummins 5.5 HGJAB-1270 RV alternator Set Recreational Vehicle QG 5500 LP Lp unit is the quietest generator in it’s class and functions exceptionally low vibration levels. It’s simple to set up and the self-diagnostic capability streamlines repairing. The maker’s 3-year minimal service warranty ensures you’re covered for the digital voltage and the long haul policy offers a safeguard for stability as home appliance loads alter.

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At Colorado Standby we are proud to offer our consumers with the tools they require to have the very best RV power generator experience. As part of our mission of excellence, we not just supply beautiful customer care for any client who may be uncertain about what’s right for them, we also offer free shipping!

Looking for more? View all of our lp generators for RV’s.

* Two 30A breakers.

The quietest machine in its class features very low vibration levels at 67 decibels. RV QG 5500 generators are perfect for Class A motorhomes (2 air conditioners), Class C motorhomes, and 5th wheels. Recreational Vehicle QG 6500 and 7000 generators are ideal for Class A motorhomes (2 air conditioners) and Class A diesel motorhomes.

Marquis Gold Recreational Vehicle Generators now have the RV QG designation. They are available in 5500 Watt (RV QG 5500) and 7000 Watt (Recreational Vehicle QG 7000) gas models along with 5500 Watt (RV QG 5500 LP) and 6500 Watt (Recreational Vehicle QG 6500 LP) LP fuel generators. A few of the outstanding functions of this system include:

Developed to be the Quietest system in its class

It has extremely low vibration levels

Provides an integrated style with an enclosed muffler for easy setup

Self-diagnostic capability to streamline troubleshooting and lower repair costs.

This heavy-duty alternator runs 2 Air conditioners with power to spare

Digital voltage regulators for stability as appliance loads change

Dry weight: 290 lbs.

Measurements: 33.6″ x 22.2″ x 16.7″ High


RV QG 55005.5HGJAB-901Gasoline

RV QG 5500 LP5.5HGJAB-1119Propane

Recreational Vehicle QG 6500 LP6.5HGJAB-904Propane

RV QG 70007.0HGJAB-1036Gasoline

An upgrade or brand-new setup may include Remote Start Panels, Wiring Harnesses, and Tailpipes.

ItemDescriptionDimensionsPart #Harness/ Part #

Elbow & Tailpipe KitTailpipe


22″ Long


26″ Long

155-3439 Elbow





Remote Start PanelCut-Out:

1-1/8″ x 2″

300-493610′ Harness/ 338-3489-01

30′ Harness/ 338-3489-02

Remote Start Panel w/Analog Hour MeterCut-Out:

3-5/8″ x 2-3/8″

300-493710′ Harness/ 338-3489-01

30′ Harness/ 338-3489-02

Comparable to AboveRemote Start Panel w/Digital Hour MeterCut-Out:

3-5/8″ x 2-3/8″

028-0002225′ Harness/ 044-00026

40′ Harness/ 044-00041

How to Replace the Fuel Pump and Fuel Filter on an Design 5500 RV Generator

Updated on January 18, 2019

Don Bobbitt profile image

Don Bobbitt more

Don is a retired engineer and long-time motorhome owner who delights in helping readers deal with the progressively intricate technology of RVs.

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RV Generators Require Maintenance

Having a working power alternator in your Recreational Vehicle is so hassle-free for the owner that a lot of motorhome owners, especially, can not picture not having one for their journeys.

Of course, a generator, being a mechanical device, needs maintenance and care at times. And all mechanical gadgets will eventually break down, even if they are maintained properly.

So every RV owner who has a power cell ought to be prepared to have certain things spoil.

A basic Model 5500 Recreational Vehicle gas-powered generator.

A basic Onan 5500 generator  What Happened When My Recreational Vehicle Generator Died

Recently, my power cell stopped operating on me. It had a little over 500 hours on the meter, but it had always been kept correctly.

It had been running fine up until it stopped running. I could crank it, however, it would not fire up at all.

I needed to repair this, obviously, so I did some troubleshooting. I thought it had a bad fuel pump given that this is a typical problem with generators, however, I had to do some investigation to verify my suspicion.

View of the fuel pump and fuel filter on an Onan 5500 Recreational Vehicle generator.

View of the fuel pump and fuel filter on an Onan 5500 Recreational Vehicle generator.|Source

Repairing My Recreational Vehicle Generator

To find out what was incorrect with my generator, I went through a comprehensive troubleshooting procedure and eventually validated that the fuel pump on my generator was bad.

Throughout my diagnostics, I removed the cover of the alternator and figured out, among other things, that:

There were no loose connections visible.

There were no leaking fluids.

The motor had oil in the tank.

The DC source of power was excellent.

The fuel filter was tidy.

The initial step in fixing almost anything is to get rid of the apparent things from the list of possible issues.

Discovering the Fuel Pump

And I discovered another thing: On my generator, an Onan design constructed for motorhomes, they didn’t put the fuel pump inside the power cell compartment.

Rather, for some unknown factor, they chose to mount the fuel pump and the fuel line filter onto the underside of the generator base plate.

I must keep in mind here that over the years, these alternator manufacturers can alter their styles various times.

They may make a code generator, like my 5500-watt design, and after that have a dozen or more setups of the basic alternator to fit many applications.

Where mine is set up for my motorhome, the very same core alternator unit might likewise be configured as a portable design on wheels, a home backup power source, a remotely-controlled model for remote website backup power, or any of dozens of other special applications.

In these specialty designs, peripheral parts like the fuel pump, fuel filter, carburetor, air filter, and oil drain and input, can take various forms, or, as is typically the case, be mounted in various positions.

The position of the fuel pump and fuel filter on my RV though indicated that to replace the fuel pump, or perhaps just to replace the fuel filter, you had to get under the RV and work while pushing your back. I didn’t like this, but it was what had to be done.

Buying the Fuel Pump and Fuel Filter

I decided to change both the fuel pump and the fuel filter, as individuals frequently do, since they are mounted near one another and are low-cost, and I wished to make sure that I replaced whatever was causing the problem.

Among the excellent things about having a smart device is that you constantly have a good cam on hand. Even before I looked at the power cell handbook, I crawled under my RV and took several images of the fuel pump and the fuel filter that showed the labels as well as how they were mounted.

Back home, I sat down with my particular part numbers and images and went shopping the web for the best deal on the parts I needed.

It ended up that Amazon provided me the best rate and I was able to secure free shipping within 5 days of positioning the order. When I lastly received my parts, it was time to install them and get my alterantor running again.

Setting Up the New Parts


Here is where I should discuss that when you work on a device like a gas-powered generator, there are certain safety treatments you need to follow.

I disconnected the 12-V DC to the generator, shut off the fuel lines, and I also followed the other maker requirements noted in the owner’s manual.

As soon as all of this was done, I was ready to perform the actual replacement.

View of the fuel cut-off valve on an Onan 5500 gas RV generator

View of the fuel cut-off valve on an Onan 5500 gas RV generator|Source

Tools Required

By looking at the photos I had taken, I was able to identify the tools I would need for this task:

Flat-blade screwdriver (for the hose clamps).

Crescent wrench (for taking apart the fuel pump and fuel filter from each other).

5/16 socket and wrench set (for the 2 bolts that held the fuel pump to the base plate).

1/4-inch size wood dowel (or another device, to plug the fuel line from the fuel tank).

A short piece of plumbing’s tape (to assure a great seal in between the fuel pump and the filter).

Knowing this ahead of time permitted me to take to my Recreational Vehicle just the tools I would need, not a huge tool kit full of tools.

Fuel Pump and Fuel Filter Replacement Treatment.

Considering that in my case the fuel pump and the fuel filter were on the underside of the generator, I saw and inspected that there were only 2 things I had to detach on the upper side of the generator:

The 2 wires that supplied power to the fuel pump.

The actual output fuel line from the fuel pump to the input of the fuel cut-off valve that is inline with the carburetor of the generator.

So, the first thing I did was disconnect these 2 wires and this fuel line.

Then I crawled under the RV, removed the fuel line from the fuel filter, and stuck a piece of the wood dowel into the pipe to avoid it from leaking onto the ground and me.

I then removed the 2 screws that held the fuel pump in a location with the socket wrench.

Thoroughly, I pulled down the 2 wires and the fuel line with the fuel pump-fuel filter mix connected, and with this assembly in hand, crawled out from under the RV.

I link to 50 amp coast power without any issues operating all appliances including 2 a/c units. When I operate the Onan alternator only the forward a/c runs. When the rear a/c is turned on one of 2 things take place, the alternator shuts down or the alternator breaker snaps to off. No house breakers have ever shut off when utilizing the generator nor when plugged in. In this 2002 Georgie Boy, the electrical plug is either plugged into shore power or plugged into the generator. I am looking at six feet of wiring, the alternator to plug. I have physically eliminated the plug and junction box from the power cell and found nothing disconnected, absolutely nothing burnt, nothing shorted. Do any of you have a clue what may be occurring? Such as a common Onan 5500 alternator problem that may trigger an internal short?





1132 posts

Area: Beautiful Southern Wisconsin

I travel Part-time.

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Posted July 10.

Were you ever able to run both a/c systems on the generator, or has it constantly had this problem?





9497 posts.

Location: Galveston & Burnet, TX.

I take a trip: With pets.

Report post.

Published July 11.

With both Air Conditioner’s off, switch on the generator, then the bedroom Air Conditioning … the number of amps does it pluck spike when the compressor starts? Turn it off & do the very same with the front. Also, are both Air Conditioner systems the same size and what size are they?





3759 posts.

Place: Where ever the wheels stop?

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Published July 11.

On 7/10/2019 at 5:30 PM, elibedarn said:

When the rear a/c is changed on one of 2 things take place, the machine shuts down or the alternator breaker snaps to off. In this 2002 Georgie Young boy the electrical plug is either plugged into coast power or plugged into the generator. I have physically gotten rid of the plug and junction box from the machine and discovered absolutely nothing detached, nothing scorched, nothing short.

As recommended in the reply to your question.

Start each roofing A/C and note the Present requirement of the back and the front units. When the machine is running.

You might want to make sure that all the electrical connections are tight at the generator, transfer switch, and a/c breaker panels.

I see that your coach is wired for 50 amp coast power. You require to keep in mind that when running the alternator you have just a bit more than 50 amps of current supplied from the generator.

Link to the information covering the Onan 5500 series and the different setups for LP and Fuel.







287 posts.

Place: Central Frontenac Township, Ontario.

I travel Part-time.

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Posted July 11.

Rich, I think that the Onan 5500 generator in question just puts out a max of 45.8 amps at 120 volts. Even less capability.

a-1425. pdf.

290.35 kB ยท 6 downloads.





6 posts.

Report post.

Published July 11.

Is it heavy gauge, rated for more than 50 amps? Attempt to confirm all ground connections are tidy and tight in the coach and the Onan.


kay smith.

kay smith.


2795 posts.

Place: Hueytown, Al

. I take a trip: With animals.

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Posted July 11.

As specified above, you may be pulling too much load for one of the breakers and or the alternator itself. There is no comparison of this machine to 50 amp shore power.