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Old 05-13-2011, 10:25 PM   #1
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Anyone know where to get aftermarket fuel pump for gas Onan

Hello all,

I see there is lots of talk about gas Onan Marquis Gold generators. I have a 5500 unit that is shutting off intermittently. Have found it isnt getting fuel when it does shut down and the fuel pump doesnt appear to be running when switched to prime (by sound, feel, or checking bowl drain).

Unit will restart after a while and could run for another 3 minutes, or 2 hours. Just never know. Always shuts off the same way, choppy, cutting out like its starving for fuel.

Anyone know of a drop in replacement fuel pump that would work for this application besides an Onan unit?

Thanks!
Chris
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Old 05-14-2011, 12:32 AM   #2
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Be careful. I had the same fuel pump problem and the Onan replacement part ($90.00) had a problem also. Seems Onan used an alternative supplier (read China) and it had an internal seal problem that cause your symptoms. The seal would swell with temp and stop the pump from working. I don't know of an alternate pump but have been warned about using an automotive type pump because of pressure.
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Old 05-14-2011, 12:33 AM   #3
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I forgot. Have you checked the filter and fuel line for blockage before you spend your money on a fuel pump?
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Old 05-14-2011, 07:13 AM   #4
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I don't remember if the gold used the vane type pump or not. (Sometimes being 71 just sucks) If it uses the old marquis vane pump, you can dissassemble the pump and clean the vanes. Onan called for a filter BEFORE the pump. However 95% of the MH manuf. installed one after the pump. Small pieces of rust get caught in the vanes and cause the vanes to stick. Try installing a filter before the pump and cleaning the pump. If you install a new pump, you must be certain it is the right press. I believe the old pumps were 2 and 1/2 lbs.
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Old 05-14-2011, 08:01 AM   #5
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You might try Generator parts, Generac, Kohler, Onan | Kim Hotstart heaters, Sensaphone, Freeze Alarm, LG / LS contactors. They have discount prices on most items and I think they can get most of what you may need when they don't have it in stock.
Good luck!
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Old 05-14-2011, 09:47 AM   #6
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Quote:
Originally Posted by bjsheldon View Post
I forgot. Have you checked the filter and fuel line for blockage before you spend your money on a fuel pump?
No buzz, no humm, no evidence of the pump running when I hit the prime button after it shuts off like it does before it shuts down.

Chris
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Old 05-14-2011, 09:49 AM   #7
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Quote:
Originally Posted by ga traveler View Post
I don't remember if the gold used the vane type pump or not. (Sometimes being 71 just sucks) If it uses the old marquis vane pump, you can dissassemble the pump and clean the vanes. Onan called for a filter BEFORE the pump. However 95% of the MH manuf. installed one after the pump. Small pieces of rust get caught in the vanes and cause the vanes to stick. Try installing a filter before the pump and cleaning the pump. If you install a new pump, you must be certain it is the right press. I believe the old pumps were 2 and 1/2 lbs.
Thanks,

This does have the filter both before and after the pump. Pump is round and looks like an inline fuel filter itself. I had read somewhere else they were in the 2 psi range. Most of the cheapie automotive pumps are 5 psi.

Chris
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Old 05-14-2011, 09:52 AM   #8
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Quote:
Originally Posted by bjsheldon View Post
Be careful. I had the same fuel pump problem and the Onan replacement part ($90.00) had a problem also. Seems Onan used an alternative supplier (read China) and it had an internal seal problem that cause your symptoms. The seal would swell with temp and stop the pump from working. I don't know of an alternate pump but have been warned about using an automotive type pump because of pressure.
That is my exact concern, that the replacement pump is the same pile o junk that the original could be. I did put a fan on the generator with the cover off to see if it made a difference to it shutting off. Did not seem like it did but I did not have the fan pointed right at the pump either...

Chris
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Old 05-14-2011, 10:40 AM   #9
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Put a clear tub on after the pump to see if it is getting air. if so the gas line has a hole or leak. I had to change the gas line from the gas tank. Cut a hole in floor so I could get to it, top of gas tank. Could be a lose wire.
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