Coast Resorts Open Roads Forum: Class A Motorhomes: ONAN MARQUIS 5500 GENERATOR
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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > ONAN MARQUIS 5500 GENERATOR

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dalefuji

Milton, Pa.

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Posted: 07/25/23 05:44pm Link  |  Quote  |  Print  |  Notify Moderator

MODEL 5.5 BGMFA11578G
I changed the oil, oil filter, spark plugs and set at .025. I also changed air filter. I started Generator and it would run for a short time and then get rough and shut off. Took air filter off and sprayed starter fluid in carb. It still ran rough and now it won't start at all.
I left it set and figured I go up tomorrow and see if it starts, thinking maybe I flooded carb.
Any suggestions. Maybe the fuel pump is bad.

eHoefler

ozark mountains

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Posted: 07/26/23 05:29am Link  |  Quote  |  Print  |  Notify Moderator

How much gas do you have in the tank. Has to be over a 1/4 tank.


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dougrainer

Carrolton, Texas

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Posted: 07/26/23 08:02am Link  |  Quote  |  Print  |  Notify Moderator

How many hours on Genset and what Year Motorhome. Doug

cjd10

Charleston SC

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Posted: 07/26/23 08:35am Link  |  Quote  |  Print  |  Notify Moderator

Those were the symptoms when my fuel pump went bad.
Assuming you have enough gas in the tank


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dalefuji

Milton, Pa.

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Posted: 07/26/23 03:47pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for all the information;
I have 1998 Holiday Rambler Endeavor (very good condition, kept in my pole barn.)
I have ordered a fuel pump and carburetor. 25 years old "it's time"
I have a good friend/mechanic.
Updates:
New cooling unit on back of refrigerator.
New 10 gal. hot water heater.
New transmission.
New circuit boards. (Hydraulic leveling board, Temp. control for air and heat, control board for holding tanks)
It is 460 Ford engine and I get 8 mpg driving at 50 in cruise control.
Thanks for listening (smile)

Bruce Brown

Northern NY

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Posted: 07/27/23 05:58am Link  |  Quote  |  Print  |  Notify Moderator

As noted, make sure your gas tank has enough in it to supply the generator. The symptoms you're describing sound like it's just running out of fuel.


There are 24 hours in every day - it all depends on how you choose to use them.
Bruce & Jill Brown
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dougrainer

Carrolton, Texas

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Posted: 07/27/23 08:38am Link  |  Quote  |  Print  |  Notify Moderator

An easy way to determine if running out of fuel. When it stops, when restarting, Does if fire within 2 to 5 seconds or even run shortly. If so, fuel starvation is NOT the cause. The carb bowl will run a genset for 30 to 90 seconds. You did not state HOURS on Genset. But your symptoms show Fuel/Carb gummed up. Since you have a carb on order, replace it FIRST, then run the genset. If it runs correctly send the fuel pump back. Another cause on Gensets that are at least 10 years old and older, the rubber fuel line from the Gasoline tank is probably dry rotted and sucking air, which WILL cause fuel starvation. The FIRST thing you do when having this type problem on an older genset is to connect a gallon gas can DIRECT to the fuel inlet on the Genset with a rubber fuel line. IF the genset runs correctly, now you have the fun of replacing the rotted fuel line from the Tank to the Genset. Doug

dalefuji

Milton, Pa.

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Posted: 07/27/23 02:39pm Link  |  Quote  |  Print  |  Notify Moderator

The gas tank is between 3/4 and full.
I will check rubber fuel line and probably replace it regardless.
Thanks

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