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Onan gas generator prime ?
11-20-2011, 06:31 PM
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#1
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Member
Join Date: Sep 2011
Location: Arkansas
Posts: 83
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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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Monkey, pilot of a Great Dane hauler,
1ST CAV
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11-20-2011, 07:27 PM
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#2
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Senior Member
Join Date: Aug 2008
Posts: 989
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1 vote for yes
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2007 Fleetwood Revolution LE 40V
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11-20-2011, 07:51 PM
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#3
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Senior Member
Newmar Owners Club Texas Boomers Club
Join Date: Dec 2003
Location: Mo
Posts: 1,831
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Quote:
Originally Posted by Tha_Rooster
1 vote for yes
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X2 for the above
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2004 Newmar DSDP 4015-370hp Cummins-Spartan Chassis-2008 Saturn Vue- Texas Boomers Member-FMCA #402879
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11-20-2011, 08:21 PM
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#4
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Member
Workhorse Chassis Owner
Join Date: Jun 2010
Posts: 45
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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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Phil & Lenore Kennedy
Ontario, Can.
05 HR Vacationer
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11-20-2011, 08:35 PM
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#5
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Senior Member
Monaco Owners Club
Join Date: May 2009
Posts: 2,393
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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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JimM
2008 Monaco Knight 40 SKQ | The "68"
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11-20-2011, 09:11 PM
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#6
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 4,546
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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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2004 32' F53 National Sea Breeze 1311 - Segway X2 - Sadie, Co-Pilot & Best Friend 1800 lb, 400 HP, Corvette LS1 Powered Mid-Engine Sandrail 1997 Dodge Ram 2500 CTD - 1994 Dodge Ram Stepside 1500
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11-20-2011, 09:15 PM
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#7
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Member
Join Date: Sep 2011
Location: Arkansas
Posts: 83
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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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Monkey, pilot of a Great Dane hauler,
1ST CAV
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11-21-2011, 01:51 AM
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#8
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Sep 2007
Location: KAPOLEI, HAWAII AND VANCOUVER, WASHINGTON
Posts: 1,847
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Quote:
Originally Posted by monkey
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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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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01 WINNEBAGO 35U W20.8.1L SW Wa, Hi. Good Sam, SKP. AMSOIL fluids. BANKS ecm program. SCAN GAUGE II w/ Ally temp. 2 LIFELINE GPL-6CT AGM Batts on their sides. TST tptts. K&N panel air filter. AERO mufflers. TAYLOR plug wires. ULTRA POWER track bar. KONI fsd shocks
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11-21-2011, 04:17 AM
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#9
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Senior Member
Fleetwood Owners Club
Join Date: Apr 2008
Location: Tampa, FL
Posts: 326
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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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Papa John & Mother Mary 2008 Fleetwood Fiesta LX, 34N
2008 Hyundai Elantra - Toad
Tampa, Florida
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11-21-2011, 06:40 AM
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#10
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 4,546
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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?
__________________
2004 32' F53 National Sea Breeze 1311 - Segway X2 - Sadie, Co-Pilot & Best Friend 1800 lb, 400 HP, Corvette LS1 Powered Mid-Engine Sandrail 1997 Dodge Ram 2500 CTD - 1994 Dodge Ram Stepside 1500
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11-21-2011, 07:40 AM
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#11
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Senior Member
Join Date: Jun 2009
Posts: 1,075
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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
Dave
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Dave in Virginia
1978 Winnebago Chieftain
Dodge M400 - 440-3
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11-21-2011, 08:16 AM
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#12
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Senior Member
Ford Super Duty Owner Winnebago Owners Club
Join Date: Nov 2010
Location: Williamsburg, VA
Posts: 395
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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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1999 Winnebago Minnie 29', Ford V10, Close to stock.
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11-21-2011, 09:25 AM
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#13
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Senior Member
Join Date: Jun 2011
Location: Phx, Arid~zona
Posts: 4,546
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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.
__________________
2004 32' F53 National Sea Breeze 1311 - Segway X2 - Sadie, Co-Pilot & Best Friend 1800 lb, 400 HP, Corvette LS1 Powered Mid-Engine Sandrail 1997 Dodge Ram 2500 CTD - 1994 Dodge Ram Stepside 1500
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11-21-2011, 09:39 AM
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#14
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Senior Member
Fleetwood Owners Club
Join Date: Nov 2011
Location: Long Island N.Y.
Posts: 265
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My 5.5 Onan - yes
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" A day without camping is....WORK"
2003 Bounder 35R
3 Jack Russell's
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