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Old 11-19-2019, 04:57 AM   #1
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Onan 4000 fuel filter

ok, generator will run for 4 or 5 min. then sputter and quit with or without load. replaced fuel filter still same thing. throwing code 36, any ideas. much appreciated in advance. it is on 2011 coachman freelander, a 4000 watt onan. many thanks.
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Old 11-19-2019, 06:21 AM   #2
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I would bet bad fuel pump. I replaced mine that only had about 12 hrs on the generator.
Also relocated out from under the circuit board to the frame rails.
Airtex E11007 Fuel Pump from Amazon.
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Old 11-19-2019, 06:26 AM   #3
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If your RV and the Onan share the same gas tank it is necessary to have sufficient gas in the tank. Some say 1/4 to 1/3 full. If I need to use it overnight I make sure it is closer to 1/2 full
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Old 11-19-2019, 07:34 AM   #4
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Had this exact issue last year. Similar rig as yours and same generator. New fuel Pump and filter fixed it. Kind of a PIA to R&R but definitely doable. You can google this and find some you tube videos to help you out. My Onan had about 40 hours. Go figure.

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Old 11-19-2019, 06:13 PM   #5
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Quote:
Originally Posted by Rocky Larson View Post
If your RV and the Onan share the same gas tank it is necessary to have sufficient gas in the tank. Some say 1/4 to 1/3 full. If I need to use it overnight I make sure it is closer to 1/2 full
thank you, i am aware of that, this is my third rv, tank is full.
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Old 11-19-2019, 10:20 PM   #6
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Same issue here, low hrs micro 4k, first fuel.pump failure was at 80hrs, replaced with oem onan, that one lasted 70 hrs, went with airtex from amazon 300 hrs and still no issues.
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Old 11-20-2019, 12:22 AM   #7
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I second the bad/ failing fuel pump; many start by dying after 60-90-min, progressing to dying after 15, then 3-5? Replacement can be $25-$30 and 1-hour of your time, or $300-$600 in a shop? Special tools I needed (had) were T-27 TORX Bit and line wrench set/ flare nut wrenches. both available HF fairly cheap.
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Old 11-21-2019, 06:00 AM   #8
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Went through this issue on our last RV with Onan 4000. I agree with replacing the fuel pump with the aftermarket version from Amazon. We put about 300 hours on it before selling the coach.
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Old 11-22-2019, 09:47 AM   #9
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I replaced mine with Airtex purchased on Amazon.I would be leery of no name replacements available online.Name brand is worth the extra few dollars.
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Old 11-22-2019, 09:52 AM   #10
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I replaced mine with an Airtex purchased on Amazon after low hour oem failed a second time. The airtex has almost 300 hours with no problem. This is one of the few time I wouldn’t recommend anything other than oem
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