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Re: [GMCnet] I NEVER give up. (Onan) [message #192298 is a reply to message #192280]

Wed, 05 December 2012 12:34

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma:

Senior Member

Robin Hood wrote on Wed, 05 December 2012 11:28

<snip>
Once we were ready to try again, Tom determined that the carb was
flooding. Furthermore, while the motor is turning over, it's SPITTING fuel vapor OUT the carb, and driving fuel UP the shaft that the throttle linkage rides on.

See, that's something I don't understand. My theoretical understanding of a four cycle engine is that it acts like an air pump.
intake>compression>power>exhaust.
I didn't think there should be ANY air going back the OTHER way, OUT of the carb.

We unhooked the power the fuel pump, and when the fuel-air mixture finally got right I guess, the Onan fired and ran for a bit until it ran out of fuel from the carb.

Anybody got any advice? I don't mind buying a new carb if I have to, nor do I mind doing a rebuild using one of JimK's kits. I'd like to better understand what I'm dealing with, though.

--
Robin Hood

Robin,

Your understanding is correct, but it is a little bit simplified.
Summary: I don't think you have a problem.

Yes, the Suck,Push,Pop,Poey is correct, but the problem comes in the fine points. The valves require some time (in flywheel rotation) to open and close. Since the intake valve is often still closing when the piston changes direction, at low speeds (with low charge inertia) it is possible to have "charge reversion" where the charge air actually reverses flow direction for a very short period. This is a big problem for hot starts on governor controlled engines as the throttle plate is not restricting the flow.

And you may also have a float/needle/seat problem to deal with, but if that is the case, leave the pump running for most of a minute and see if fuel drips out of the carburetor. If it does, you do.

Matt

P.S. You are probably the first person to connect a battery backwards - In you garage - This week.
P.S.S. You may have damaged other things like the voltage regulator or some features on the control board. (If it were a boat, I would give you the long list of things to be checked and possibly repaired/replaced.)

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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[Message index]

		[GMCnet] I give up. (Onan) By: Robin Hood on Sun, 21 October 2012 14:31
		Re: [GMCnet] I give up. (Onan) By: jimk on Sun, 21 October 2012 14:38
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Sun, 21 October 2012 14:48
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Sun, 21 October 2012 15:23
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Sun, 21 October 2012 16:07
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Sun, 21 October 2012 16:53
		Re: [GMCnet] I give up. (Onan) By: jimk on Sun, 21 October 2012 16:54
		Re: [GMCnet] I give up. (Onan) By: jimk on Sun, 21 October 2012 16:58
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Sun, 21 October 2012 17:35
		Re: [GMCnet] I give up. (Onan) By: emerystora on Sun, 21 October 2012 17:45
		Re: [GMCnet] I give up. (Onan) By: mickeysss on Thu, 28 November 2013 15:42
		Re: [GMCnet] I give up. (Onan) By: Otterwan on Thu, 28 November 2013 15:53
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 28 November 2013 16:02
		Re: [GMCnet] I give up. (Onan) By: USAussie on Thu, 28 November 2013 16:19
		Re: [GMCnet] I give up. (Onan) By: mickeysss on Thu, 28 November 2013 19:08
		Re: [GMCnet] I give up. (Onan) By: kerry pinkerton on Sun, 21 October 2012 14:45
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Sun, 21 October 2012 14:58
		Re: [GMCnet] I give up. (Onan) By: mike miller on Sun, 21 October 2012 20:34
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Sun, 21 October 2012 20:47
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Sun, 21 October 2012 22:29
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 22 October 2012 07:16
		Re: [GMCnet] I give up. (Onan) By: Mr ERFisher on Mon, 22 October 2012 09:25
		Re: [GMCnet] I give up. (Onan) By: mike miller on Mon, 22 October 2012 11:47
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Mon, 22 October 2012 10:22
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Mon, 22 October 2012 10:36
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 22 October 2012 10:51
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Mon, 22 October 2012 11:10
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Mon, 22 October 2012 12:07
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 22 October 2012 20:15
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Tue, 23 October 2012 17:05
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Tue, 23 October 2012 17:20
		Re: [GMCnet] I give up. (Onan) By: tphipps on Tue, 23 October 2012 18:22
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 24 October 2012 20:44
		Re: [GMCnet] I give up. (Onan) By: roy1 on Wed, 24 October 2012 21:10
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Wed, 24 October 2012 21:37
		Re: [GMCnet] I give up. (Onan) By: mike miller on Thu, 25 October 2012 01:11
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 25 October 2012 07:26
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Thu, 25 October 2012 09:05
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Thu, 25 October 2012 09:34
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Thu, 25 October 2012 09:49
		Re: [GMCnet] I give up. (Onan) By: Carl S. on Thu, 25 October 2012 09:55
		Re: [GMCnet] I give up. (Onan) By: roy1 on Thu, 25 October 2012 10:54
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Thu, 25 October 2012 10:45
		Re: [GMCnet] I give up. (Onan) By: mike miller on Thu, 25 October 2012 11:10
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Thu, 25 October 2012 11:15
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 25 October 2012 11:23
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Thu, 25 October 2012 11:49
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Thu, 25 October 2012 17:26
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 25 October 2012 18:54
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Thu, 25 October 2012 19:21
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 25 October 2012 19:31
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Thu, 25 October 2012 19:35
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 25 October 2012 20:32
		Re: [GMCnet] I give up. (Onan) By: hal kading on Thu, 25 October 2012 21:59
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Fri, 26 October 2012 06:37
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 26 October 2012 06:55
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Fri, 26 October 2012 07:25
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Fri, 26 October 2012 08:31
		Re: [GMCnet] I give up. (Onan) By: stick miller on Fri, 26 October 2012 10:18
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 26 October 2012 10:25
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Fri, 26 October 2012 13:15
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Fri, 26 October 2012 17:51
		Re: [GMCnet] I give up. (Onan) By: USAussie on Sat, 27 October 2012 16:25
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Mon, 22 October 2012 08:34
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Sun, 28 October 2012 13:50
		Re: [GMCnet] I give up. (Onan) By: USAussie on Sun, 28 October 2012 15:19
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 01 November 2012 20:47
		Re: [GMCnet] I give up. (Onan) By: USAussie on Fri, 02 November 2012 06:00
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Fri, 02 November 2012 16:07
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 12 November 2012 12:08
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 12:28
		[GMCnet] I give up. (Onan) By: Robin Hood on Mon, 12 November 2012 12:46
		Re: [GMCnet] I give up. (Onan) By: Bruce Hart on Mon, 12 November 2012 12:49
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Mon, 12 November 2012 13:01
		Re: [GMCnet] I give up. (Onan) By: C Boyd on Mon, 12 November 2012 14:00
		Re: [GMCnet] I give up. (Onan) By: USAussie on Mon, 12 November 2012 15:13
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Mon, 12 November 2012 15:16
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Mon, 12 November 2012 16:36
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Mon, 12 November 2012 15:45
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 12 November 2012 15:50
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 16:32
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 12 November 2012 18:27
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Mon, 12 November 2012 16:48
		Re: [GMCnet] I give up. (Onan) By: USAussie on Mon, 12 November 2012 16:52
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 18:17
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Mon, 12 November 2012 18:36
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 18:53
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Mon, 12 November 2012 19:04
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 19:56
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 12 November 2012 20:07
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Mon, 12 November 2012 21:16
		Re: [GMCnet] I give up. (Onan) By: Carl S. on Mon, 12 November 2012 21:58
		Re: [GMCnet] I give up. (Onan) By: mickeysss on Wed, 14 November 2012 00:35
		Re: [GMCnet] I give up. (Onan) By: mike miller on Tue, 13 November 2012 03:49
		[GMCnet] I give up. (Onan) By: Robin Hood on Tue, 13 November 2012 22:05
		Re: [GMCnet] I give up. (Onan) By: Dave Mumert on Tue, 13 November 2012 22:53
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Tue, 13 November 2012 23:52
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 14 November 2012 00:07
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 14 November 2012 02:26
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 14 November 2012 03:10
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 14 November 2012 06:38
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 14 November 2012 06:43
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 14 November 2012 07:00
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Wed, 14 November 2012 07:31
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 14 November 2012 07:37
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 14 November 2012 06:47
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Wed, 14 November 2012 06:47
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 14 November 2012 15:23
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 14 November 2012 15:35
		Re: [GMCnet] I give up. (Onan) By: James Hupy on Wed, 14 November 2012 15:57
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Wed, 14 November 2012 17:47
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 14 November 2012 18:43
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 14 November 2012 20:06
		Re: [GMCnet] I give up. (Onan) By: WD0AFQ on Wed, 14 November 2012 21:04
		Re: [GMCnet] I give up. (Onan) By: ljdavick on Thu, 15 November 2012 00:02
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Thu, 15 November 2012 04:31
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 15 November 2012 19:19
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 15 November 2012 21:16
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Thu, 15 November 2012 21:20
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 15 November 2012 21:25
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Thu, 15 November 2012 21:36
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Thu, 15 November 2012 21:37
		Re: [GMCnet] I give up. (Onan) By: mickeysss on Thu, 15 November 2012 22:42
		Re: [GMCnet] I give up. (Onan) By: mike miller on Fri, 16 November 2012 02:08
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Fri, 16 November 2012 03:14
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 16 November 2012 20:16
		Re: [GMCnet] I give up. (Onan) By: ljdavick on Fri, 16 November 2012 20:36
		Re: [GMCnet] I give up. (Onan) By: kerry pinkerton on Fri, 16 November 2012 20:48
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Fri, 16 November 2012 21:02
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 16 November 2012 21:33
		Re: [GMCnet] I give up. (Onan) By: USAussie on Fri, 16 November 2012 21:34
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Fri, 16 November 2012 21:36
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 16 November 2012 21:43
		Re: [GMCnet] I give up. (Onan) By: sgltrac on Fri, 16 November 2012 21:52
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Fri, 16 November 2012 21:40
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Sat, 17 November 2012 08:18
		Re: [GMCnet] I give up. (Onan) By: ljdavick on Wed, 21 November 2012 02:28
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 21 November 2012 06:10
		Re: [GMCnet] I give up. (Onan) By: powerjon on Wed, 21 November 2012 08:06
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 21 November 2012 09:23
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 21 November 2012 15:00
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Wed, 21 November 2012 15:24
		Re: [GMCnet] I give up. (Onan) By: jhbridges on Wed, 21 November 2012 17:42
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Wed, 21 November 2012 15:38
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 21 November 2012 17:23
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Thu, 22 November 2012 02:32
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Thu, 22 November 2012 07:45
		Re: [GMCnet] I give up. (Onan) By: k2gkk on Thu, 22 November 2012 08:38
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Thu, 22 November 2012 08:03
		Re: [GMCnet] I give up. (Onan) By: philipswanson on Mon, 24 December 2012 09:53
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 24 December 2012 11:28
		Re: [GMCnet] I give up. (Onan) By: USAussie on Mon, 24 December 2012 14:52
		Re: [GMCnet] I give up. (Onan) By: Ken Burton on Sat, 17 November 2012 02:51
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Sat, 17 November 2012 08:10
		Do Not Give up on the Onan! (was: I give up...) By: mike miller on Thu, 15 November 2012 06:06
		Re: Do Not Give up on the Onan! (was: I give up...) By: Ken Burton on Fri, 16 November 2012 02:55
		Re: [GMCnet] I give up. (Onan) By: USAussie on Wed, 14 November 2012 16:12
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Wed, 14 November 2012 16:54
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Wed, 14 November 2012 17:30
		Re: [GMCnet] I give up. (Onan) By: ljdavick on Mon, 12 November 2012 23:34
		Re: [GMCnet] I give up. (Onan) By: Ken Henderson on Wed, 14 November 2012 07:33
		Re: [GMCnet] I give up. (Onan) By: Gail Marks Cruiser on Wed, 14 November 2012 18:04
		Re: [GMCnet] I give up. (Onan) By: JohnL455 on Thu, 22 November 2012 09:40
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Mon, 26 November 2012 20:40
		Re: [GMCnet] I give up. (Onan) By: ljdavick on Mon, 26 November 2012 20:50
		Re: [GMCnet] I give up. (Onan) By: Jim Galbavy on Mon, 26 November 2012 23:27
		Re: [GMCnet] I give up. (Onan) By: mike miller on Thu, 29 November 2012 01:43
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 29 November 2012 18:11
		Re: [GMCnet] I give up. (Onan) By: Matt Colie on Thu, 29 November 2012 18:43
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Tue, 04 December 2012 18:27
		Re: [GMCnet] I give up. (Onan) By: A Hamilto on Tue, 04 December 2012 19:19
		Re: [GMCnet] I NEVER give up. (Onan) By: Matt Colie on Wed, 05 December 2012 08:39
		Re: [GMCnet] I NEVER give up. (Onan) By: Robin Hood on Wed, 05 December 2012 10:28
		Re: [GMCnet] I NEVER give up. (Onan) By: James Hupy on Wed, 05 December 2012 10:47
		Re: [GMCnet] I NEVER give up. (Onan) By: A Hamilto on Wed, 05 December 2012 17:03
		Re: [GMCnet] I NEVER give up. (Onan) By: A Hamilto on Wed, 05 December 2012 11:17
		Re: [GMCnet] I NEVER give up. (Onan) By: sgltrac on Wed, 05 December 2012 11:23
		Re: [GMCnet] I NEVER give up. (Onan) By: jhbridges on Wed, 05 December 2012 12:11
		Re: [GMCnet] I NEVER give up. (Onan) By: Matt Colie on Wed, 05 December 2012 12:34
		Re: [GMCnet] I NEVER give up. (Onan) By: Robin Hood on Wed, 05 December 2012 15:15
		Re: [GMCnet] I NEVER give up. (Onan) By: Carl S. on Wed, 05 December 2012 15:44
		Re: [GMCnet] I NEVER give up. (Onan) By: Carl S. on Wed, 05 December 2012 15:45
		Re: [GMCnet] I NEVER give up. (Onan) By: Carl S. on Wed, 05 December 2012 15:46
		Re: [GMCnet] I NEVER give up. (Onan) By: kerry pinkerton on Wed, 05 December 2012 17:06
		Re: [GMCnet] I NEVER give up. (Onan) By: Ken Burton on Wed, 05 December 2012 18:38
		Re: [GMCnet] I NEVER give up. (Onan) By: jhbridges on Thu, 06 December 2012 07:31
		Re: [GMCnet] I NEVER give up. (Onan) By: Robin Hood on Thu, 06 December 2012 07:47
		Re: [GMCnet] I NEVER give up. (Onan) By: Matt Colie on Fri, 07 December 2012 05:23
		Re: [GMCnet] I NEVER give up. (Onan) By: Dave Mumert on Fri, 07 December 2012 10:20
		Re: [GMCnet] I NEVER give up. (Onan) By: mike miller on Fri, 07 December 2012 10:57
		Re: [GMCnet] I NEVER give up. (Onan) By: Ken Henderson on Fri, 07 December 2012 11:51
		Re: [GMCnet] I NEVER give up. (Onan) By: sgltrac on Wed, 05 December 2012 11:19
		Re: [GMCnet] I give up. (Onan) By: Gerald Wheeler on Tue, 04 December 2012 20:09
		Re: [GMCnet] I give up. (Onan) By: hnielsen2 on Thu, 28 November 2013 15:58
		Re: [GMCnet] I give up. (Onan) By: Robin Hood on Thu, 28 November 2013 16:03

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