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Old 06-23-2010, 09:55 PM   #1
erniet's Avatar
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Location: Wisconsin & U.P.
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Generator fuel drain back

I am new here so if this question has been asked before and there is an answer I apologize. I did look before starting this post. Can a check valve be installed on the inlet line for a Diesel Generator so you would not have to go through extended bleeding procedures when the main fuel tank goes below the 1/4 mark? 2004 Itasca Meridian Thanks.

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Old 06-24-2010, 08:19 AM   #2
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I don't see why not, but isn't it easier to keep the tank above 1/4?

Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 06-24-2010, 11:09 PM   #3
"Formerly Diplomat Don"
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Location: Moorpark, Ca.
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erniet.......On your diesel coach engine the fuel is pumped at high pressure to the engine. It doesn't necessarily use all of the fuel and returns a large amount to the fuel tank. When it's cold out, this helps to keep the fuel from gelling while the engine is running. I'm guessing your Onan generator works under the same principles. You may cause a fuel delivery issue if you put in a check valve.

Have you really had a problem with running the generator dry? I did it once since I've owned the coach while driving with the A/C on. Once I refueled, I pushed the prime button on the generator and it started right away.
Don & Mary
2014 Newmar Dutch Star - All Electric - 450 ISL
2016 GMC Canyon 4WD Crew Cab
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Old 06-25-2010, 07:11 AM   #4
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When you get below 1/4 tank the fuel does not run back , you draw air into the line.It stops drawing so if you are out in the boonies you don't empty the tank and get stuck.A check valve would only add more resistance when trying to reprime.On my Onan it is just a matter of holding the stop switch on for a minute to draw the fuel back to the generator.
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