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Old 05-31-2015, 08:06 PM   #15
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Check these 2 things

1- be sure your fuel filters for the Gen are not backwards- i.e.- fuel flowing the direction of the arrows

3- Make sure your check valve in the fuel line (if you have one) is not stuck or partially stuck. It is a ball in a seat with a spring- it keeps the line from losing prime when the fuel pump for gen is not running.

Good luck
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Old 06-02-2015, 08:38 PM   #16
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Let me know if the fuel pump change solves the issue. Mine is still under warranty but the Onan generator shop didn't find anything wrong with it so they wouldn't change it. stronger pump may do the job. I feel like the engine fuel line and the generator fuel line are competing for gas?
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Old 06-02-2015, 08:47 PM   #17
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If you can run the Onan off a fuel can and everything is better than the problem is probably a internal collapsing of the fuel line coming from the RV fuel tank. On some older model we have even found the tube inside the RV tank to be broken and not picking up the fuel properly. Just a reminder the main RV tank needs to be at least 1/2 full for the Onan to pull fuel properly and airflow is critical with an air cooled engine.
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Old 07-03-2015, 12:07 PM   #18
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We have even seen the fuel line coming from the tank to the Onan get cracks in the line and then it sucks air...replacing the fuel line solved many problems.
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