| My Never Broken Onan [message #172791] |
Sun, 10 June 2012 11:46  |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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Senior Member |
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Dang it. I hit the start button before I got my finger off the prime button. Onan started right up then died. Will turn over but no start. 8 years, first time it has failed me.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: My Never Broken Onan [message #172793 is a reply to message #172791] |
Sun, 10 June 2012 11:57  |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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| WD0AFQ wrote on Sun, 10 June 2012 09:46 |
Dang it. I hit the start button before I got my finger off the prime button. Onan started right up then died. Will turn over but no start. 8 years, first time it has failed me.
Dan
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Dan,
I have no experience with that particular problem, but it sounds like a fuse issue to me. Could be the fuse in your prime circuit or the one on the control board. At least that's where I would look first.
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: My Never Broken Onan [message #172812 is a reply to message #172791] |
Sun, 10 June 2012 14:11 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Dan,
I usually start by jumping 5 and 9 at the ocntrol board. If the pump runs -- clicking rapidly and never slowing down -- I am out of gas. Jumping 5 and 9 is what the prime button does -- but from that location you cannot hear the pump run.
Dennis
| WD0AFQ wrote on Sun, 10 June 2012 11:46 |
Dang it. I hit the start button before I got my finger off the prime button. Onan started right up then died. Will turn over but no start. 8 years, first time it has failed me.
Dan
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] My Never Broken Onan [message #172821 is a reply to message #172803] |
Sun, 10 June 2012 16:12 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Dan,
I always hold the prime button while cranking. I don’t know why I do it this way, maybe Tom Hampton told me to, I really don’t know. In any case it’s never been a problem for me.
You say no fuel coming out of the pump to the carb - is the fuel pump working? If so, then you have 12 volts, so no fuse problem. If not then diagnose the voltage.
How old are the fuel lines going to the Onan? Perhaps a test from a gas-can could eliminate the possibility of a bad fuel pump. Hook line from pump inlet to gas-can. If she runs then I would suspect a bad line or is there a fuel filter in there somewhere?
Good luck!
Larry Davick
The Mystery Machine
1976(ish) Palm Beach
Fremont, CA
On Jun 10, 2012, at 11:38 AM, Dan Gregg wrote:
>
>
> No fuel coming out of fuel pump to the carb. Next, will check to see if any is going to the fuel pump. Too hot to do over one check at a time. No shade this time of day. And, we all know I struggle to be just a shade tree mechanic. I suspect I blew something by not getting my finger off the prime button before hitting START.
> dan
> --
> Dan & Teri Gregg
>
>
> http://danandteri.blogspot.com/
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] My Never Broken Onan [message #172831 is a reply to message #172791] |
Sun, 10 June 2012 18:36 |
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The only way I can start my Onan is to hold the prime button. After it
starts, I release the prime button and she continues to run just fine.
bdub
-----Original Message-----
From: On Behalf Of Dan Gregg
Dang it. I hit the start button before I got my finger off the prime button.
Onan started right up then died. Will turn over but no start. 8 years, first
time it has failed me.
Dan
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bdub
bdub.net
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| Re: My Never Broken Onan [message #172860 is a reply to message #172791] |
Sun, 10 June 2012 21:23 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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I agree with Emery. For a fuse to function as a fuse it needs to be faily close to rated limit at times, so that it is the weak link and something else does not act as a fuse. Considering that fuse could have been built at Littlefuse just up the street from me here in 1972 for a 73 coach, and has been to the moon and back, I think it deserves to blow. So Dan, now that it runs did you still want or need my 4 extra isolators? I'm glad you didn't replace them first and then have it fail and then you blame the isolators. Ha.
John Lebetski
Woodstock, IL
77 Eleganza II
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| Re: [GMCnet] My Never Broken Onan [message #172903 is a reply to message #172860] |
Mon, 11 June 2012 06:26 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Standard rule of thumb is fuse at twice the nominal current draw of the circuit. That's large enough to withstand turn-on surges, but small enough to open before wires get hot enough to melt - assuming the wire guage has been propelrly selected for the load. For motor starts, a SloBlow <tm> fuse is indicated.
--johnny
'76 23' transmode norris
'76 palm beach
From: John R. Lebetski <gransport@aol.com>
To: gmclist@temp.gmcnet.org
Sent: Sunday, June 10, 2012 10:23 PM
Subject: Re: [GMCnet] My Never Broken Onan
I agree with Emery. For a fuse to function as a fuse it needs to be faily close to rated limit at times, so that it is the weak link and something else does not act as a fuse. Considering that fuse could have been built at Littlefuse just up the street from me here in 1972 for a 73 coach, and has been to the moon and back, I think it deserves to blow. So Dan, now that it runs did you still want or need my 4 extra isolators? I'm glad you didn't replace them first and then have it fail and then you blame the isolators. Ha.
--
John Lebetski
Chicago, IL
77 Eleganza II
Source America First
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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