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Old 06-28-2020, 07:34 PM   #1
Darinhauer
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Default Generac Generator won’t stay running

My Generac diesel generator starts up just find but won’t stay running. The oil is full, fuel above half tank.
If I hold the glow plug or starte switch it will stay running.
The regulator was my first suspicion but the regulator in these things are the size of a electronic brain box for your car. Any thoughts?
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Old 07-28-2020, 06:41 PM   #2
ricklin
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Default Filters??

Have you replaced both the fuel and the air filters for the genset? The fuel line for the generator is set up so the generator can't run the fuel tank dry and leave you stranded. Thus if your rig is low on fuel the generator may not be getting any fuel.
If the generator has a lot of hours on it your issue could be poor compression. The glow plugs will increase compression, that's basically how they work. The heat expands the air in the cylinder and the compression ignites the fuel.
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Old 10-18-2020, 05:44 PM   #3
wfiskum
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If you haven't replaced your genset fuel filter, you should. It is pretty easy to do and you can buy them online through Amazon. Since you are "down there" you might as well change the oil and air filter as well. Use a hose crimping tool to stop the fuel flow before you disconnect the lines from the fuel filter or else you'll have a mess. I installed a fuel shutoff valve on mine and bought some longer fuel lines so I could take the fuel filter down instead of reaching into the generator. Good luck!
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Old 10-19-2020, 10:07 PM   #4
Darinhauer
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324 hours
Fully serviced
Wire #14 when 12v power placed to it the unit stays running.
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Old 10-29-2020, 10:04 PM   #5
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Quote:
Originally Posted by Darinhauer View Post
324 hours
Fully serviced
Wire #14 when 12v power placed to it the unit stays running.
Is yours the Generac Quietpact 75D? How long will it run before shutting down? If less than 6 seconds, it's likely a safety cutout such as low oil level, low oil pressure, high coolant temp, or a bad sensor. It could also be a shorted Wire 18.

I had similar issues last summer. Lube oil pressure switch was bad but then we found wire #18 was corroded and shorting to ground which is essentially what happens when a shutdown is initiated (Wire 18 is grounded on the board). A bad wire translated to a grounding signal which removes voltage to Wire 14 which kills fuel and shuts the engine down.

By applying voltage to Wire 14, I believe you are essentially bypassing any shutdown initiated by Wire 18 if there was a problem identified during the startup sequence.

Hope this helps!
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Old 10-29-2020, 10:33 PM   #6
Darinhauer
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That helps a ton. I tested all sensors but didn’t even look at wire #18. I’ll check it out.
Thank you
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Old 10-29-2020, 10:33 PM   #7
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And yes it’s the 75D
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Old 11-09-2020, 06:55 AM   #8
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How'd it go?
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Old 05-10-2021, 03:35 PM   #9
silvereagle
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yes please let us know how it went, seems we are having similar issues with our 75d genset. Just spent 3k and after leaving the state it is again shutting down...
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Old 05-10-2021, 03:45 PM   #10
Darinhauer
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Default Generac Generator Won't Stay Running

So, I contacted Generac and they don;t have any dealers or shops here in Oregon so I took it to a diesel engine repair guy that does a lot of work on Onans. After extensive testing of sensors and circuitry, he decided that the electronic board is bad and didn't want to get into trying to get parts from the mfg., so it's back home waiting for me to call Generac to see how much a board is, how much it costs and figure out if I try to repair it or have to replace it - Ugh!
I have other priorities right now so likely won;t get to this for quite some time. Meantime, always go where there's power
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Old 05-10-2021, 06:19 PM   #11
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Quote:
Originally Posted by Darinhauer View Post
So, I contacted Generac and they don;t have any dealers or shops here in Oregon so I took it to a diesel engine repair guy that does a lot of work on Onans. After extensive testing of sensors and circuitry, he decided that the electronic board is bad and didn't want to get into trying to get parts from the mfg., so it's back home waiting for me to call Generac to see how much a board is, how much it costs and figure out if I try to repair it or have to replace it - Ugh!
I have other priorities right now so likely won;t get to this for quite some time. Meantime, always go where there's power
Hey Darin - this is the control board if I recall correctly. ASAP is a great company that is fair in prices and support for these gensets. Did you say you had the diagnostic and repair manual? If not, I can send it to you. ~Phil
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Old 05-10-2021, 06:29 PM   #12
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That's actually not a bad price at all. Thanks Paul.
I do have a manual but not sure it is for this exact model, if you have one please send.
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Old 05-10-2021, 06:39 PM   #13
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Hey Darin - just shot you a private message. Phil
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Old 05-10-2021, 07:02 PM   #14
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Got it, thanks a ton, it may be a stint but I'll reach back out once I get this thing fixed.
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