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Old 08-19-2021, 07:57 PM   #1
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Onan QD 7500 won't start

So I went to cool down the RV before our trip and the generator was running. I then turned the AC on, both kicked in. I then went inside the house for a bit. Came out and the generator was off. I didnt put too much thought into it as the RV was under a 1/4 tank and figured it did a auto shutdown.
I then filled up but it still won't start. I cranks over but seems like it isn't getting fuel to fire. I tried priming it by holding the stop switch down for 30sec but still nothing.
Generator has 300hrs on it and a fresh oil change. What should my next steps be?
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Old 08-22-2021, 03:40 PM   #2
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Error code is 36.
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Old 08-22-2021, 03:52 PM   #3
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I'll bet 30 seconds of priming isn't enough given it sucked all of the diesel from the lines when it got below 1/4 full. Try for at least 5 minutes of priming first and then maybe several ten seconds cranking, with a few minutes of waiting in between, and see what that does.

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Old 08-22-2021, 04:30 PM   #4
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Well I got it fired back up. NOTE TO SELF! Never run the generator below 1/4 fuel. I don't know if this helped but I removed the return line from the generator and attached a hose and cycled the pump to verify pump volume. I don't know if that helped purge the air, but we are back in business!! Thank God!
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