Question about Generac Guardian Ultra Source 15,000 Watt Portable Generator #04582

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Generac NP 50G Stops after 2-30min.

I just bought a RV with a Generac NP50G with about 500hrs. It will run for 2min to 30min fine then shut down, work fine with load. Checked the overheat sensor and it is disconnected so not the issue. Though it might be fuel filter but it stops quickly like it loses spark (not sure that is true though and it is not seized from over heat). If I try to start it quickly when I hit the start button nothing happens but in about 30 seconds it will start right back up.
Any help would be greatly appreciated

Posted by Anonymous on

  • Anonymous Oct 26, 2009

    I replaced the fule filter, oil pressure sensor, and choke solinoid. And the issue is still exactly the same. Strats well then shuts down after a couple minuests or less. I am confident it is loss of spark, there is no "sputtering" it just shuts off.

    I also noticed that the previous owner tried to bypass the oil sensor as there is two wires to it, one chasis ground and one that goes back in the engine (I assume control board). Also the over heat sensor is disconected.

    I also noticed that the choke solinoid is always charged (choke open). It was hot out when first starting but still assume the choke would shut when first starting, is this normal?

  • Anonymous Oct 28, 2009

    The problem ended up being a dirty fuel bowl in the carb. After cleaning it ran fine.

    I now have a seperate issue I will post though.



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Check the oil sensor circuit. I know when I take out or short out the sensor ckt on mine, it'll keep on running. low oil isn't good for any motor.

Posted on Oct 20, 2009

Testimonial: "Parts are on order and will verify the fix. But this makes a lot of since based."

  • oscaromar200 Aug 15, 2011

    What would be the average cost to get a carb and fuel bowl cleaned?




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How do I clean fuel bowl of 15k generac

Posted on Dec 20, 2009


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