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Old 06-08-2015, 03:48 PM   #1
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On the road generator problems

We will be in West Valley, Utah in a couple of days. Our Onan Marquis 5500 will start when it is cold but not restart when it is warmed up. Then under a load, (air conditioner) it dies in a couple of minutes. Does anyone know of any place in or near our destination that could help.
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Old 06-08-2015, 03:51 PM   #2
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Here's a link to rvservicereviews for Utah.it may help you narrow it down to where you're going.
http://www.rvservicereviews.com/StateList.asp?state=UT
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Old 06-08-2015, 03:55 PM   #3
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My bet is fuel pump, which could be $40 part (generic) or $75 (onan).
Can you help us diagnose? Get it running, allow it to shut down, and then see if it will "prime"? (you'd need to pull the fuel hose off)
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Old 06-08-2015, 04:08 PM   #4
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We put on a new fuel filter, and then before hooking back up the fuel line turned the generator over a bit and no fuel came through the line. But I do not know where the fuel pump is located, is it on the tank or after the filter near the carb???
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Old 06-08-2015, 04:27 PM   #5
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I had the same generator. Like yours mine would fuel starve when it got hot.
Starting from the carb, trace the fuel line back. The fuel pump is on that line, somewhere between the generator and the tank - most likely near the generator.
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Old 06-08-2015, 04:32 PM   #6
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Thank you. I also wonder if the rubber hose may be deteriorating (sp). Will look for the pump but I am guessing it could be the the pump. Traveling now, will check this evening.
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Old 06-08-2015, 04:57 PM   #7
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The fuel pump should be underneath the generator, left side, near the front. It is attached with a couple of bolts and the fuel line comes up through a hole in the bottom plate. Most of the OEM and replacement pumps are made by Airtex. You can get the number off the pump and do a search on Amazon. I bought one for about $35 with free shipping for my 5500 last year. Also, yours may have two fuel filters, one on the inlet side of the pump and another next to the carburetor. Most have eliminated the filter attached to the carb by replacing it with a fitting and using just the one filter on the pump.
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Old 06-09-2015, 12:15 PM   #8
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My same model generator did the same thing. Fuel Pump fixed it. Takes about 20 minutes or less to change.
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