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Generac 3500xl generator motor starts up runs for a few seconds and quits

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Check fuel flow through the metal fuel tap under the tank
they corrode internally and block the flow to the catby

Posted on Apr 22, 2017

  • Tom Walter
    Tom Walter Apr 23, 2017

    fuel flow is fine

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It might be the Low Oil Shutdown. Be sure the oil is filled to the top of the dipstick, and try running it again. If it is low it will kill any ignition sequence as it pulls the oil up into the head and sets off the sensor.

Hope this helps!

Posted on Apr 26, 2017

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Posted on Jan 02, 2017

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SOURCE: Generac 43903 standby Generator overspeed indicator on starting

I have a generator that did the same thing. It would start and then stop within a few seconds. The more expensive generators have an oil level safety switch to prevent the engine from burning up. There is usually a wire connecting to the switch on the outside of the engine near the oil fill hole. Remove this wire and try to start the generator. If it runs without a problem then it is the switch. You need to remove the switch and take it apart carefully and clean it. There is a small float inside the assembly. When the oil runs low the float allows the switch to short to ground which kills the spark to the spark plug. Hope that helps.

Bob Janelli

Posted on Oct 01, 2009

Testimonial: "This is good information in the event that the low oil switch is part of the problem."

  • 42 Answers

SOURCE: wiring diagram for Generac engine on standby generator

here is a wiring diagram for that engine:

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Posted on Mar 13, 2009

  • 384 Answers

SOURCE: 10kw Generac Guardian not cranking, shows rpm sense loss

Sounds like Generator mode switch should be "ON".

Posted on Sep 08, 2009

  • 10 Answers

SOURCE: I have a 17kw generac generator that will run

I have the 18KW model and was told that most alarms relate to a low battery. Make sure the battery charger in the Transfer Switch is properly feeding the battery or hook up a mobil battery charger to the battery and see if the alarm goes away. Good Luck.

Posted on Oct 12, 2009

  • 1 Answer

SOURCE: Generac Guardian 15 kw overspeed fault

Did you remember to set the overspeed shutdown threshold on the control board?

Posted on Jun 07, 2010

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I need a rectifier or avr for generac 3500 xl genarator


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    1 Answer

    Generator hard to start and sputters like its missing


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    Low voltage out 79.2 volts


    Randy, connect up your volt meter and try manually reving up the engine. Even a few hundred RPM can make a big difference in the generator output.

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    Mar 03, 2014 | Electrical Supplies

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    Generac Guardian 12 KW Model 04456-2 shuts down on overspeed in cold weather


    Leigh,
    See my 5/22/12 comments on my "overspeed fault" problem resolution [Generac 43903 standby Generator overspeed indicator on starting] . If it only runs for a few seconds and then quits, you may have a similar condition to the one my unit had. A good technician should be able to diagnose the problem and determine if you have a similar failure to the one I had, or one of the other causes suggested by RSG000.

    Jan 20, 2012 | Generac 13,000 Watt / 13,000 Watt Home...

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    Generac NP 50G Stops after 2-30min.


    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.

    Oct 20, 2009 | Generac Guardian Ultra Source 15,000 Watt...

    6 Answers

    Generac 43903 standby Generator overspeed indicator on starting


    I have a generator that did the same thing. It would start and then stop within a few seconds. The more expensive generators have an oil level safety switch to prevent the engine from burning up. There is usually a wire connecting to the switch on the outside of the engine near the oil fill hole. Remove this wire and try to start the generator. If it runs without a problem then it is the switch. You need to remove the switch and take it apart carefully and clean it. There is a small float inside the assembly. When the oil runs low the float allows the switch to short to ground which kills the spark to the spark plug. Hope that helps.

    Bob Janelli

    Oct 01, 2009 | Generac 13,000 Watt / 13,000 Watt Home...

    1 Answer

    Generac Generator won't stay running


    fuel problem, the float in the carborator is stuck, if you tap on the carborator bowl it will probably get freed up.if not take the bowl off and spray the insides with carb. cleaner.

    Apr 11, 2009 | Generac 5622 GP Series GP5000 6,250 Watt...

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