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Old 09-02-2017, 06:44 AM   #1
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Cummings/Onan Generator?

I just purchased new FR3 about 3 months. And my generator killed on me and will not start.
The generator is not getting fuel to the carburetor.
I disconnected the fuel line that goes back to the motorhomes fuel tank and there no gas flowing out. I also disconnect the line going to the carburetor and pressed the start switch nothing there.

The fuel gauge on the motorhome is reading half tank.

Queston ? Is the generator fuel gravity fed?
Thanks
GM
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Old 09-02-2017, 07:27 AM   #2
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Onan Generator

The generator has a 12 volt fuel pump located under the generator


Bob



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Originally Posted by GM_LA View Post
I just purchased new FR3 about 3 months. And my generator killed on me and will not start.
The generator is not getting fuel to the carburetor.
I disconnected the fuel line that goes back to the motorhomes fuel tank and there no gas flowing out. I also disconnect the line going to the carburetor and pressed the start switch nothing there.

The fuel gauge on the motorhome is reading half tank.

Queston ? Is the generator fuel gravity fed?
Thanks
GM
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Old 09-02-2017, 08:06 AM   #3
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Do you know if fuel to the generator pump is gravity fed?
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Old 09-02-2017, 08:10 AM   #4
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No, it is not gravity fed. The pump is inline, usually under the generator. If it shares a tank with the rv, make sure you have more than 1/4 tank and it is close to level.
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Old 09-02-2017, 08:19 AM   #5
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Its fed by the motorhomes tank and the gauge is showing half of tank.
Im going to fill the motorhome to test. Thanks
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Old 09-02-2017, 10:18 AM   #6
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If the generator is turning over and there is no fuel getting to the carb. you either have a clogged fuel filter or a bad fuel pump. I know of quite a few fuel pumps going bad on these generators.
Good luck...
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Old 09-02-2017, 02:23 PM   #7
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Thanks ! Even though the fuel gauge reads better than a half I'm going fill it up just to rule it out.
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Old 09-04-2017, 07:39 AM   #8
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Stupid question. Have you primed the fuel line prior to starting? The indoor panel rocker switch operates in both directions. Down and hold to prime and up to start.

I find holding the rocker down for 30 seconds or longer produces the best results.
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Old 09-04-2017, 07:52 AM   #9
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Also check to make sure you have driven your RV around a bit. We just used our generator for 7 days straight due to no power from Harvey, I kept checking the fuel gouge and it read no lower than 3/4 tank, thought these Onan's run forever on very little gas, then it shutdown and would not start again. So I drove the RV about 6 miles to nearest gas station, by the time I pulled into a pump my fuel gauge was on empty. May just be a false reading on the gas gauge.
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Old 09-04-2017, 07:42 PM   #10
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Cummings/Onan Generator?

Thanks to everyone helping me trouble shoot the issue with the generator. I started looking around today and found a 7.5 amp blown fuse that's for the fuel pump. Replaced it and it started up. Tested several times with no problem .
If I recall My old onan didn't have one.Click image for larger version

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