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Old 11-20-2011, 07:31 PM   #1
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Onan gas generator prime ?

Weather prevents me right now from checking this out, but my owners manual on my Onan 4K gas gen says nothing about pressing the "off" switch to prime the motor... I had a few people tell me this when we were shopping for a mh,,, and when the weather gets better, I'll verify if pressing the off switch activates the electric fuel pump for the gen... But for now,,, what do you all say ???? Does pressing the "OFF" switch activate the electric fuel pump for the gen ??
I hate to crank several times to get it started after sitting a couple/few weeks.... And no, I don't ever overheat the starter,,, Thanks, Darel
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Old 11-20-2011, 08:27 PM   #2
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1 vote for yes
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Old 11-20-2011, 08:51 PM   #3
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Quote:
Originally Posted by Tha_Rooster View Post
1 vote for yes

X2 for the above
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Old 11-20-2011, 09:21 PM   #4
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Thats exactly what happens. Depressing the bottom of the rocker sw. energizes the primer circuit/pump, protected by a 5 amp fuse (mine). I usually hold it for about 10 seconds.
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Old 11-20-2011, 09:35 PM   #5
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I know holding down off to prime my onan diesel generator is true and it does work. Heaven knows I run it out of gas often enough

Not sure about a gas genny tho...
Don't recall how it was on the pace arrow...
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Old 11-20-2011, 10:11 PM   #6
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My 5500 manual says to hold it for 30 seconds. You can do the same at the generator. The carb fill in a lot less than 30 seconds. If mine has been sitting for a few days, I have to prime it several times to get to keep running.
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Old 11-20-2011, 10:15 PM   #7
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Excellent !!! Thanks Very Much to all of you !!! This is a GREAT site I have found !!! Thanks again,,,, Darel
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Old 11-21-2011, 02:51 AM   #8
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Quote:
Originally Posted by monkey View Post
Weather prevents me right now from checking this out, but my owners manual on my Onan 4K gas gen says nothing about pressing the "off" switch to prime the motor... I had a few people tell me this when we were shopping for a mh,,, and when the weather gets better, I'll verify if pressing the off switch activates the electric fuel pump for the gen... But for now,,, what do you all say ???? Does pressing the "OFF" switch activate the electric fuel pump for the gen ??
I hate to crank several times to get it started after sitting a couple/few weeks.... And no, I don't ever overheat the starter,,, Thanks, Darel
that's the way the prime works on my 5.5 onan.
i always drain the float bowl on the carb when i park it for a week or more to keep deteriorated gas from plugging up the jets in the carb.
it primes easily with fresh gas when i need to start it.
maybe this info will help.

http://hollawayhome.com/RV%20Stuff/P...20Handbook.pdf
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Old 11-21-2011, 05:17 AM   #9
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Holding down the "off" works on mine and that's what was stated during out PDI a few years back. Hasn't failed us yet, works great.
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Old 11-21-2011, 07:40 AM   #10
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Does it still take a couple of primes to get it to stay running after a couple of weeks of not running it?
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Old 11-21-2011, 08:40 AM   #11
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Depends on model of generator.
Emerald 4.0BGE - Circuit design would not allow priming.
Microlite 4.0KY Spec A-H - Manuals due not indicate priming capability
Microlite 4.0KY Spec J & later - Manuals indicate priming capability

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Old 11-21-2011, 09:16 AM   #12
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my 1999 microlite 4.0 does not have a primer function. question: does anybody's genny have a prime function that is NOT labeled on the switch? mine is not labeled, and does not prime. the other examples i have heard of were labeled prime/stop, and had a prime function.
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Old 11-21-2011, 10:25 AM   #13
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My 5.5 Onan only has GEN above the switch with a lightning bolt on the switch. Can't get at the genny right now, and I don't remember if it did say Prime.
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Old 11-21-2011, 10:39 AM   #14
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My 5.5 Onan - yes
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