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Old 06-06-2016, 05:14 PM   #1
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Gen start question

Just picked up our 2016 Greyhawk 31FK - but we're second owner so no PDI and not much of a chance to test anything.

So far the only bump is the genny. Our old Onan 4K fired up with little effort. I'm a bit confused about the start procedures.

Do I always Prime before starting? Or is that only in cold weather? If so, how long do you hold Prime down for?

I've held Start for 5 seconds or so about three times and it's cranking but not catching. I will check to make sure I've got more than 1/4 tank of gas, but any suggestions if it continues to be grumpy?


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Old 06-06-2016, 07:23 PM   #2
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Mine can take some time to start, when it's been unused for awhile. I hold the starter till it starts or dies. It can take 2 tries to get it going.


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Old 06-06-2016, 08:01 PM   #3
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Congratulations on the new to you Greyhawk and welcome to the forum.
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Old 06-06-2016, 08:52 PM   #4
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whelp - it's just not starting. cranks but doesn't catch. 25 hours on the clock - so it has to be something simple. time to debug the thing.
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Old 06-06-2016, 10:08 PM   #5
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Mine is like that start it will sometimes die restart and its fine if it sits a while long crank to start
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Old 06-07-2016, 03:31 AM   #6
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If the Onan hasn't been run for a while the fuel system needs to be primed. I run mine every month and before the first start attempt I prime for 15-20 seconds. Then I press the start side of the switch and it fires in a few seconds. I NEVER run the started more than a few seconds then re-prime if necessary. Starters will get hot and burn up. Don't need that.

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Old 06-07-2016, 06:07 AM   #7
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On mine, you hold the switch to the prime (off) position until it lights up, then hold the start position until it starts. That usually takes less than 15 seconds.

That said, I bought mine second hand from a guy who had already had to replace the carburator because it gummed up from sitting too long. He said, and I do religiously, to run the genny for at least 30 min once a month. I have owned the unit for 3 years now and the genny starts every time.

If yours won't start it may be carburator gumming.
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Old 06-07-2016, 06:11 AM   #8
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Old 06-07-2016, 06:48 AM   #9
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I often have to re-prime as many as 3 times before the thing will start. It's a very common issue.
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Old 06-07-2016, 10:37 PM   #10
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If it just cranks with no start and a full tank of gas, you may want to check the fuel pump. I had similar issue on my old genny when I first owned it. After removing the fuel line I clamped on a gravity fed line affixed to a small container with a little gas in it. She started right up. Replaced the fuel pump and issue was resolved.
The onan on my Greyhawk operates and feels no different than my old 23 year old genny. That genny always started on the third go when cold and not used for a while, beit a few days or a few months. It also had a start position lever on the side of the unit itself. If off, it wouldn't crank.
Starting The New genny is identical, hold prime and start, kicks in after two or three goes cold, one go when warm. Never had varnishing or gumming issues on the old genny. It would sit upto three months without a start.

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