Home » Public Forums » GMCnet » Onan Fuel Pump
| Onan Fuel Pump [message #162408] |
Wed, 07 March 2012 12:08  |
LNelson
Messages: 335
Registered: December 2008
Location: Springfield, MO
Karma: 0
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Senior Member |
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I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
Thoughts? Criticisms? Snide remarks (always welcome).
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT
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| Re: Onan Fuel Pump [message #162410 is a reply to message #162408] |
Wed, 07 March 2012 12:12  |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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| LNelson wrote on Wed, 07 March 2012 11:08 |
I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
Thoughts? Criticisms? Snide remarks (always welcome).
|
Just for curiosity, does it click or feel like the armature is oscillating up and down or is it totally dead? Others have found close replacements but I recall that a typical low pressure oscillating generic unit like you can find at Autozone or O'Reilly's will work.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: Onan Fuel Pump [message #162411 is a reply to message #162408] |
Wed, 07 March 2012 12:39 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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Many of the generic fuel pumps will have too high pressure for the Onan... many have had success repairing the old..
here is a link to Hardie's photo album
http://www.gmcmhphotos.com/photos/showgallery.php?cat=3636
Dennis
| LNelson wrote on Wed, 07 March 2012 12:08 |
I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
Thoughts? Criticisms? Snide remarks (always welcome).
|
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Onan Fuel Pump [message #162413 is a reply to message #162412] |
Wed, 07 March 2012 13:08 |
LNelson
Messages: 335
Registered: December 2008
Location: Springfield, MO
Karma: 0
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Emery, I installed a clear vinyl fuel line onto the pump and then put the bitter end of the line into a can of gas. The little sucker tries but no cigar. There appears to be an o ring in the plunger and I wonder how you get to that. I will spray mass quantities of carb cleaner into the pump while it is out on my bench, then I am going to the dentist.
It wants to pump, it just cannot cut the mustard.
Tanks are full, btw.
Larry
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT
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| Re: [GMCnet] Onan Fuel Pump [message #162415 is a reply to message #162413] |
Wed, 07 March 2012 13:19 |
emerystora
Messages: 4442
Registered: January 2004
Karma: 13
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It may be the check valve in the pump which is a small ball.
A link was just posted to Hardie's photos of the cleaning of the pump.
Check that out and cleaning it will likely solve the problem.
Emery Stora
On Mar 7, 2012, at 12:08 PM, Larry Nelson wrote:
>
>
> Emery, I installed a clear vinyl fuel line onto the pump and then put the bitter end of the line into a can of gas. The little sucker tries but no cigar. There appears to be an o ring in the plunger and I wonder how you get to that. I will spray mass quantities of carb cleaner into the pump while it is out on my bench, then I am going to the dentist.
>
> It wants to pump, it just cannot cut the mustard.
>
> Tanks are full, btw.
>
> Larry
> --
> Springfield, MO
> Ex GMC'er, then GM Busnut
> now '77 Eleganza ARS WB0JOT
> _______________________________________________
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| Re: [GMCnet] Onan Fuel Pump [message #162417 is a reply to message #162408] |
Wed, 07 March 2012 13:37 |
powerjon
Messages: 2446
Registered: January 2004
Karma: 5
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If it doesn't suck fuel out of the tank be sure to check the fuel line from the tank to the fuel pump. This assumes that your pump does click and you have checked the filter in the bottom and reassembled the bottom with the gasket.
J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 Buskirk 30' Stretch
1975 Avion (Under Reconstruction)
Michigan
On the road in Tucson
On Mar 7, 2012, at 11:08 AM, Larry Nelson wrote:
>
>
> I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
>
> Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
>
> Thoughts? Criticisms? Snide remarks (always welcome).
> --
> Springfield, MO
> Ex GMC'er, then GM Busnut
> now '77 Eleganza ARS WB0JOT
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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J.R. Wright
GMC GreatLaker
GMC Eastern States
GMCMI
78 30' Buskirk Stretch
75 Avion Under Reconstruction
Michigan
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| Re: Onan Fuel Pump [message #162423 is a reply to message #162408] |
Wed, 07 March 2012 15:13 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir: I found a 3 lb in line at NAPA that bolted right in.
| LNelson wrote on Wed, 07 March 2012 13:08 |
I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
Thoughts? Criticisms? Snide remarks (always welcome).
|
C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] Onan Fuel Pump [message #162459 is a reply to message #162423] |
Thu, 08 March 2012 09:05 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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As usual we carry them in stock,Look in our ONAN sectin.
On Wed, Mar 7, 2012 at 1:13 PM, Charles Boyd <covered-wagon@comcast.net> wrote:
>
>
> Sir: I found a 3 lb in line at NAPA that bolted right in.
>
>
>
>
>
>
> Â LNelson wrote on Wed, 07 March 2012 13:08
>> I have "done did" my diagnostics. My conclusion is that my Onan fuel pump DOES NOT SUCK. Now, as you can guess, that is a bad thing.
>>
>> Has anyone ever replaced one of these with one of the readily available, generic electric fuel pumps you can buy anywhere? I have one of these on my Kohler marine generator on my houseboat (4 banger, probably twice the fuel burn). I might try to go get one of these and get the smaller version I can buy so as not to overpower the float.
>>
>> Thoughts? Criticisms? Snide remarks (always welcome).
>
>
> --
> C. Boyd
> 76 Crestmont by Midas
> East Tennessee
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Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Onan Fuel Pump [message #162529 is a reply to message #162408] |
Fri, 09 March 2012 06:12 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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I had two issues with this. First one is well documented here. A thorough
cleaning is in order. The second one was that the supply line from the
tank was rotted, and pinched between the coach body and frame because the
frame pads had settled. Those are very durable units and not many fail
On Wed, Mar 7, 2012 at 11:08 AM, Larry Nelson <
larrynelsonarchitect@mchsi.com> wrote:
>
>
> I have "done did" my diagnostics. My conclusion is that my Onan fuel pump
> DOES NOT SUCK. Now, as you can guess, that is a bad thing.
>
> Has anyone ever replaced one of these with one of the readily available,
> generic electric fuel pumps you can buy anywhere? I have one of these on my
> Kohler marine generator on my houseboat (4 banger, probably twice the fuel
> burn). I might try to go get one of these and get the smaller version I can
> buy so as not to overpower the float.
>
> Thoughts? Criticisms? Snide remarks (always welcome).
> --
> Springfield, MO
> Ex GMC'er, then GM Busnut
> now '77 Eleganza ARS WB0JOT
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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| Re: Onan Fuel Pump [message #162530 is a reply to message #162408] |
Fri, 09 March 2012 06:36 |
Galen
Messages: 146
Registered: November 2011
Location: New Virginia, IA
Karma: 0
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Senior Member |
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I just went through this in December. Powerjon described what mine was - I replaced the fuel lines on the whole machine and after that it will pump just fine. It never any spilled gas, but it was either collapsed or had some deteriorated connection as it just couldn't suck from the tank.
Galen Briggs
New Virginia, Iowa
1978 Palm Beach
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| Re: [GMCnet] Onan Fuel Pump [message #162531 is a reply to message #162529] |
Fri, 09 March 2012 08:13 |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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In the diagnosis, after you find no suck from the tank by the pump, simply connect a hose to the pump then dangle it in a gas can. See if it will pull fuel from there. If not-- you are right, if it does suck fuel then you have certanly pointed to an issue with the hose going to the tank.
BTW, far and again, the first issue to always suspect is s bad electric fuel pump-- they just seem to fail often.
Jim Bounds
------------------------
________________________________
From: Steven Ferguson <botiemad11@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Friday, March 9, 2012 7:12 AM
Subject: Re: [GMCnet] Onan Fuel Pump
I had two issues with this. First one is well documented here. A thorough
cleaning is in order. The second one was that the supply line from the
tank was rotted, and pinched between the coach body and frame because the
frame pads had settled. Those are very durable units and not many fail
On Wed, Mar 7, 2012 at 11:08 AM, Larry Nelson <
larrynelsonarchitect@mchsi.com> wrote:
>
>
> I have "done did" my diagnostics. My conclusion is that my Onan fuel pump
> DOES NOT SUCK. Now, as you can guess, that is a bad thing.
>
> Has anyone ever replaced one of these with one of the readily available,
> generic electric fuel pumps you can buy anywhere? I have one of these on my
> Kohler marine generator on my houseboat (4 banger, probably twice the fuel
> burn). I might try to go get one of these and get the smaller version I can
> buy so as not to overpower the float.
>
> Thoughts? Criticisms? Snide remarks (always welcome).
> --
> Springfield, MO
> Ex GMC'er, then GM Busnut
> now '77 Eleganza ARS WB0JOT
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Fathom the hypocrisy of a nation where every citizen must prove they have
health insurance......but not everyone has to prove they're a citizen.
Steve Ferguson
Sierra Vista, AZ
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| Re: [GMCnet] Onan Fuel Pump [message #162687 is a reply to message #162531] |
Sun, 11 March 2012 19:02 |
nancy mercier
Messages: 62
Registered: February 2012
Karma: 0
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Member |
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If you can do without the solenoid, what purpose does it serve in the first
place? Sorry I'm a newbie
Nancy M
On Fri, Mar 9, 2012 at 7:13 AM, Jim Bounds <gmccoop@yahoo.com> wrote:
> In the diagnosis, after you find no suck from the tank by the pump, simply
> connect a hose to the pump then dangle it in a gas can. See if it will
> pull fuel from there. If not-- you are right, if it does suck fuel then
> you have certanly pointed to an issue with the hose going to the tank.
>
> BTW, far and again, the first issue to always suspect is s bad electric
> fuel pump-- they just seem to fail often.
>
> Jim Bounds
> ------------------------
>
>
> ________________________________
> From: Steven Ferguson <botiemad11@gmail.com>
> To: gmclist@temp.gmcnet.org
> Sent: Friday, March 9, 2012 7:12 AM
> Subject: Re: [GMCnet] Onan Fuel Pump
>
> I had two issues with this. First one is well documented here. A thorough
> cleaning is in order. The second one was that the supply line from the
> tank was rotted, and pinched between the coach body and frame because the
> frame pads had settled. Those are very durable units and not many fail
>
> On Wed, Mar 7, 2012 at 11:08 AM, Larry Nelson <
> larrynelsonarchitect@mchsi.com> wrote:
>
> >
> >
> > I have "done did" my diagnostics. My conclusion is that my Onan fuel pump
> > DOES NOT SUCK. Now, as you can guess, that is a bad thing.
> >
> > Has anyone ever replaced one of these with one of the readily available,
> > generic electric fuel pumps you can buy anywhere? I have one of these on
> my
> > Kohler marine generator on my houseboat (4 banger, probably twice the
> fuel
> > burn). I might try to go get one of these and get the smaller version I
> can
> > buy so as not to overpower the float.
> >
> > Thoughts? Criticisms? Snide remarks (always welcome).
> > --
> > Springfield, MO
> > Ex GMC'er, then GM Busnut
> > now '77 Eleganza ARS WB0JOT
> > _______________________________________________
> > GMCnet mailing list
> > Unsubscribe or Change List Options:
> > http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> >
>
>
>
> --
> Fathom the hypocrisy of a nation where every citizen must prove they have
> health insurance......but not everyone has to prove they're a citizen.
> Steve Ferguson
> Sierra Vista, AZ
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
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>
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| Re: [GMCnet] Onan Fuel Pump [message #162700 is a reply to message #162687] |
Sun, 11 March 2012 22:13 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| nancy mercier wrote on Sun, 11 March 2012 19:02 |
If you can do without the solenoid, what purpose does it serve in the first
place? Sorry I'm a newbie
Nancy M
|
Supposedly this was to prevent fuel from siphoning into the Onan if the carb needle valve stuck open. The powerdrawer was made for any RV, some of which could have the fuel tank level above the Onan. However someone here (DanG?) had a fuel spill in the Onan that was, perhaps, caused by high fuel tank pressure when the vent system malfunctioned. A number of GMCers have removed it without apparent problem. Probably more still have it with no problem. When working on my long idle Onan I found mine stuck closed but it easily freed up with some carb cleaner and now works OK.
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Onan Fuel Pump [message #162705 is a reply to message #162700] |
Sun, 11 March 2012 22:25 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| midlf wrote on Sun, 11 March 2012 22:13 |
| nancy mercier wrote on Sun, 11 March 2012 19:02 |
If you can do without the solenoid, what purpose does it serve in the first
place? Sorry I'm a newbie
Nancy M
|
Supposedly this was to prevent fuel from siphoning into the Onan if the carb needle valve stuck open. The powerdrawer was made for any RV, some of which could have the fuel tank level above the Onan. However someone here (DanG?) had a fuel spill in the Onan that was, perhaps, caused by high fuel tank pressure when the vent system malfunctioned. A number of GMCers have removed it without apparent problem. Probably more still have it with no problem. When working on my long idle Onan I found mine stuck closed but it easily freed up with some carb cleaner and now works OK.
|
Ans some GMCs never had them in the first place.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan Fuel Pump [message #162711 is a reply to message #162705] |
Sun, 11 March 2012 22:35 |
midlf
Messages: 2212
Registered: July 2007
Location: SE Wisc. (Palmyra)
Karma: 1
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Senior Member |
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| Ken Burton wrote on Sun, 11 March 2012 22:25 |
And some GMCs never had them in the first place.
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Oww - that's a bit I haven't heard before. Which years/models, or what circumstances, GMC or other up-fitters, didn't have the fuel cutoff solenoid?
Steve Southworth
1974 Glacier TZE064V100150 (for workin on)
1975 Transmode TZE365V100394 (parts & spares)
Palmyra WI
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| Re: [GMCnet] Onan Fuel Pump [message #162715 is a reply to message #162711] |
Sun, 11 March 2012 22:53 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| midlf wrote on Sun, 11 March 2012 22:35 |
| Ken Burton wrote on Sun, 11 March 2012 22:25 |
And some GMCs never had them in the first place.
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Oww - that's a bit I haven't heard before. Which years/models, or what circumstances, GMC or other up-fitters, didn't have the fuel cutoff solenoid?
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My 1976 Palm Beach does not have one and there are no wires any where in the harness for it. I worked on another 1977 Palm Beach that also had no solenoid or wires for it.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
[Updated on: Sun, 11 March 2012 22:54] Report message to a moderator |
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| Re: [GMCnet] Onan Fuel Pump [message #162716 is a reply to message #162711] |
Sun, 11 March 2012 22:58 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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Senior Member |
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| midlf wrote on Sun, 11 March 2012 20:35 |
| Ken Burton wrote on Sun, 11 March 2012 22:25 |
And some GMCs never had them in the first place.
|
Oww - that's a bit I haven't heard before. Which years/models, or what circumstances, GMC or other up-fitters, didn't have the fuel cutoff solenoid?
|
Let me start with some info.
My #01 is about 800 into 1973, GM upfitted... it had one., but I removed it and have never confirmed it bad.
My #02 is a late 1978, Coachman upfitted. It has one and works fine.
My #03 is an early 1977, Coachman upfitted. It has one but as I have never even tried to start the Onan...
I think it was an emissions requirement, and would have been installed on all coaches from the factory.
If you have one, and it works, I would leave it installed. I am not sure if I would spend MONEY replacing a missing or broken cutoff solenoid.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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