Home » Public Forums » GMCnet » [GMCnet] onan fuel pump
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| Re: [GMCnet] onan fuel pump [message #352997 is a reply to message #352995] |
Sat, 21 March 2020 15:31   |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Senior Member |
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Since we were told to stay home my our illustrious and benevolent Governor I
have been working on the coach. The fuel pressure/flow is so low it won't
fill up the bowl and the pump never cuts out.
Thanks!
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Billy
Massey via Gmclist
Sent: Saturday, March 21, 2020 1:24 PM
To: GMCnet
Cc: Billy Massey
Subject: Re: [GMCnet] onan fuel pump
I've been using a cheap (MrGasket?) low pressure pump from AutoZone for
many years now. Works great.
On Sat, Mar 21, 2020, 3:17 PM Len Novak via Gmclist
wrote:
> It appears the original fuel pump on my Onan is giving up the ghost
>
> Suggestions?
>
> Thanks!
>
> Len and Pat Novak
> 1978 GMC Kingsley
> The Beast II with dash lights that work and labels you can see!
> Fallbrook, CA new email: B52Rule@Roadrunner.Com
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>
> www.bdub.net/novak/
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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| Re: [GMCnet] onan fuel pump [message #352998 is a reply to message #352997] |
Sat, 21 March 2020 15:54 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Senior Member |
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Sir, maybe try taking apart and cleaning. Not much to them. Worst thing that could happen is you would have to replace it.
Len Novak wrote on Sat, 21 March 2020 16:31Since we were told to stay home my our illustrious and benevolent Governor I
have been working on the coach. The fuel pressure/flow is so low it won't
fill up the bowl and the pump never cuts out.
Thanks!
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Billy
Massey via Gmclist
Sent: Saturday, March 21, 2020 1:24 PM
To: GMCnet
Cc: Billy Massey
Subject: Re: [GMCnet] onan fuel pump
I've been using a cheap (MrGasket?) low pressure pump from AutoZone for
many years now. Works great.
On Sat, Mar 21, 2020, 3:17 PM Len Novak via Gmclist
wrote:
> It appears the original fuel pump on my Onan is giving up the ghost
>
> Suggestions?
>
> Thanks!
>
> Len and Pat Novak
> 1978 GMC Kingsley
> The Beast II with dash lights that work and labels you can see!
> Fallbrook, CA new email: B52Rule@Roadrunner.Com
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>
> www.bdub.net/novak/
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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C. Boyd
76 Crestmont
East Tennessee
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| Re: [GMCnet] onan fuel pump [message #352999 is a reply to message #352997] |
Sat, 21 March 2020 15:50 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Mar 21, 2020, at 4:31 PM, Len Novak via Gmclist wrote:
> It appears the original fuel pump on my Onan is giving up the ghost
If it is the original Bendix type pump then I’d recommend you disassemble it and clean the shuttle assembly and check valve and then re-evaluate its performance. Have you tried to run it without the integral fuel filter?
Jim Miller
1977 Eleganza
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: [GMCnet] onan fuel pump [message #353002 is a reply to message #352998] |
Sat, 21 March 2020 17:06 |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Senior Member |
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I finally got it to start and it ran for about 20 min or so. Thinking the
seals were dry. I also found an electric "Century" on/off valve just
before the pump and filter. The line from the pump to the carb is
interesting, old, greee, frayed..............something to do while we are
stuck at home.
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Charles
Boyd via Gmclist
Sent: Saturday, March 21, 2020 1:55 PM
To: gmclist@list.gmcnet.org
Cc: Charles Boyd
Subject: Re: [GMCnet] onan fuel pump
Sir, maybe try taking apart and cleaning. Not much to them. Worst thing
that could happen is you would have to replace it.
Len Novak wrote on Sat, 21 March 2020 16:31
> Since we were told to stay home my our illustrious and benevolent Governor
I
> have been working on the coach. The fuel pressure/flow is so low it won't
> fill up the bowl and the pump never cuts out.
>
> Thanks!
>
>
> Len and Pat Novak
> 1978 GMC Kingsley
> The Beast II with dash lights that work and labels you can see!
> Fallbrook, CA new email: B52Rule@Roadrunner.Com
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>
> www.bdub.net/novak/
>
>
>
>
> -----Original Message-----
> From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Billy
> Massey via Gmclist
> Sent: Saturday, March 21, 2020 1:24 PM
> To: GMCnet
> Cc: Billy Massey
> Subject: Re: [GMCnet] onan fuel pump
>
> I've been using a cheap (MrGasket?) low pressure pump from AutoZone for
> many years now. Works great.
>
> On Sat, Mar 21, 2020, 3:17 PM Len Novak via Gmclist
>
> wrote:
>
>> It appears the original fuel pump on my Onan is giving up the ghost
>>
>> Suggestions?
>>
>> Thanks!
>>
>> Len and Pat Novak
>> 1978 GMC Kingsley
>> The Beast II with dash lights that work and labels you can see!
>> Fallbrook, CA new email: B52Rule@Roadrunner.Com
>> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>>
>> www.bdub.net/novak/
>>
>>
>>
>>
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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--
C. Boyd
76 Crestmont
East Tennessee
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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| Re: [GMCnet] onan fuel pump [message #353003 is a reply to message #352994] |
Sat, 21 March 2020 17:19 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Len,
Frequently, mere disassembling and cleaning those pumps restores them to
"like new".
Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com
On Sat, Mar 21, 2020 at 4:17 PM Len Novak via Gmclist <
gmclist@list.gmcnet.org> wrote:
> It appears the original fuel pump on my Onan is giving up the ghost
>
> Suggestions?
>
> Thanks!
>
> Len and Pat Novak
> 1978 GMC Kingsley
> The Beast II with dash lights that work and labels you can see!
> Fallbrook, CA new email: B52Rule@Roadrunner.Com
> http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
>
> www.bdub.net/novak/
>
>
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
_______________________________________________
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] onan fuel pump [message #353004 is a reply to message #353003] |
Sat, 21 March 2020 18:43 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
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Senior Member |
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I disassembled and cleaned my original pump several times and it still would fail when it got hot. I finally replaced it with a Mr Gasket pump and had two failures on those as well. Bought a direct replacement Facet from Applied and have had good luck with it, although it stopped working when hot one time last Summer. I'm considering relocating it outside of the generator compartment so it doesn't get so hot.
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: [GMCnet] onan fuel pump [message #353009 is a reply to message #352994] |
Sat, 21 March 2020 19:22 |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma: 12
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Senior Member |
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That fuel solenoid is a vestigial device from when the Onan was plucked from lawn tractor duty. The Onan engineer gave a seminar at Eau Claire rally. Lawn tractor had higher mounted tank gravity feed. Could cause carb flood over and garage fire If carb float did not seat. Not needed with our belly tanks.
John Lebetski
Woodstock, IL
77 Eleganza II
[Updated on: Sat, 21 March 2020 19:23] Report message to a moderator |
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| Re: [GMCnet] onan fuel pump [message #353016 is a reply to message #352994] |
Sat, 21 March 2020 23:36 |
JohnS
Messages: 126
Registered: December 2014
Location: Vacaville, CA
Karma: -2
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Senior Member |
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I found the Airtex E11009 to be a close adaptable fit. $35 from Amazon. Look carefully though, The 6.5kw unit on my Stretch may be slightly different.
John S.
John Shutzbaugh, Vacaville, CA, ncserv@aol.com;
78 Buskirk stretch, "What were we thinking?"
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| Re: [GMCnet] onan fuel pump [message #353017 is a reply to message #353004] |
Sat, 21 March 2020 23:55 |
GMC Cruse
Messages: 606
Registered: June 2009
Location: SE Michigan
Karma: 3
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Senior Member |
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Carl S. wrote on Sat, 21 March 2020 19:43I disassembled and cleaned my original pump several times and it still would fail when it got hot. I finally replaced it with a Mr Gasket pump and had two failures on those as well. Bought a direct replacement Facet from Applied and have had good luck with it, although it stopped working when hot one time last Summer. I'm considering relocating it outside of the generator compartment so it doesn't get so hot.
The Mr. Gasket (#42S I think) one I had failed shortly after installation too. It comes with a filter and where the two parts of the filter were "crimped" together failed. The pump sucked air and died. If you use one, don't use the filter that comes with it get a different one. I ended up getting a Facet pump.
Mike K.
'75 PB
Southeast Michigan
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| Re: [GMCnet] onan fuel pump [message #353021 is a reply to message #352994] |
Sun, 22 March 2020 02:39 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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That same Bendix / Facet / Purolator / NAPA pump is used on low wing carburetor airplanes as a boost pump. The only difference is the bottom piece that holds the filter in place has a tab on it for safety wire. The other difference is because it says FAA on it, they cost 3 times the price.
We never replace the pumps. We always take them apart, clean an polish them if necessary, and reinstall them with a new gasket and filter. The gasket and filter is available from NAPA. It use to cost around $10.00 and have a NAPA number because NAPA sells or sold the pumps under their Balkamp name. I have one of those kits hanging on a peg at the airport. Unfortunately I am not there to find the number. They are very common around airports that work on Continental or Lycoming powered aircraft engines. Those bottom gaskets do wear out or harden and usually need to be replaced after 20 to 30 years of use. I have never seen a pump so broken that it needed to be replaced.
There is nothing much inside on except a check ball, a slide, and some springs. Open it up by turning the big nut on the bottom, clean it up (especially the check ball), and replace the filter and the gasket.
I tried to find the filter and gasket on NAPA's web site and failed. The NAPA part numbers for the complete pump is NAP87SV or BK6101074. At my local NAPA, which I seldom visit, the kit is on a card hanging on a peg in the store.
That pump has been around for 60 years. It has been used on everything from John Deers, to Onans, to 1970s GMC Jimmys, to my Grumman. Replacement prices for the entire pump are also all over the place starting at around $85 to over $250 for airplane versions.
The in line fuel solenoid also is important and can get clogged. They can be cleaned with carb cleaner. A lot of people have removed them and two things can happen. If you have your Onan fuel line teed into the fuel line for the main engine like they did on the Royale and other non-GM upfitted coaches and if the onan carb needle and seat sticks open or the bowl is dry, the main engine pump will suck air through the Onan carb. The engine will die from fuel starvation. It will run off of the aux tank.
The second thing that can happen on all coaches is if needle and seat leaks at all, the gas in the line will return to the tank. The Onan will then be hard to start because the pump has to pull all of the air out of the line again before it can supply gas to the Onan. I suspect that is why many people install a prime switch on the Onan to get around that problem.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] onan fuel pump [message #353038 is a reply to message #353021] |
Sun, 22 March 2020 15:47 |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Senior Member |
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Not much to it really. Popped it apart, cleaned it up, used some aviation
Permatex to seal that gasket and bolted it back together. Now to replace
the fuel line from the pump to the carb.................kinds fell apart.
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Ken
Burton via Gmclist
Sent: Sunday, March 22, 2020 12:40 AM
To: gmclist@list.gmcnet.org
Cc: Ken Burton
Subject: Re: [GMCnet] onan fuel pump
That same Bendix / Facet / Purolator / NAPA pump is used on low wing
carburetor airplanes as a boost pump. The only difference is the bottom
piece
that holds the filter in place has a tab on it for safety wire. The other
difference is because it says FAA on it, they cost 3 times the price.
We never replace the pumps. We always take them apart, clean an polish them
if necessary, and reinstall them with a new gasket and filter. The
gasket and filter is available from NAPA. It use to cost around $10.00 and
have a NAPA number because NAPA sells or sold the pumps under their
Balkamp name. I have one of those kits hanging on a peg at the airport.
Unfortunately I am not there to find the number. They are very common
around airports that work on Continental or Lycoming powered aircraft
engines. Those bottom gaskets do wear out or harden and usually need to be
replaced after 20 to 30 years of use. I have never seen a pump so broken
that it needed to be replaced.
There is nothing much inside on except a check ball, a slide, and some
springs. Open it up by turning the big nut on the bottom, clean it up
(especially the check ball), and replace the filter and the gasket.
I tried to find the filter and gasket on NAPA's web site and failed. The
NAPA part numbers for the complete pump is NAP87SV or BK6101074. At my
local NAPA, which I seldom visit, the kit is on a card hanging on a peg in
the store.
That pump has been around for 60 years. It has been used on everything from
John Deers, to Onans, to 1970s GMC Jimmys, to my Grumman. Replacement
prices for the entire pump are also all over the place starting at around
$85 to over $250 for airplane versions.
The in line fuel solenoid also is important and can get clogged. They can
be cleaned with carb cleaner. A lot of people have removed them and two
things can happen. If you have your Onan fuel line teed into the fuel line
for the main engine like they did on the Royale and other non-GM upfitted
coaches and if the onan carb needle and seat sticks open or the bowl is dry,
the main engine pump will suck air through the Onan carb. The engine
will die from fuel starvation. It will run off of the aux tank.
The second thing that can happen on all coaches is if needle and seat leaks
at all, the gas in the line will return to the tank. The Onan will then
be hard to start because the pump has to pull all of the air out of the line
again before it can supply gas to the Onan. I suspect that is why many
people install a prime switch on the Onan to get around that problem.
--
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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| Re: [GMCnet] onan fuel pump [message #353120 is a reply to message #353017] |
Wed, 25 March 2020 12:10 |
Len Novak
Messages: 676
Registered: February 2004
Location: Las Vegas, NV
Karma: -3
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Senior Member |
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Pulled that pump apart, works like a champ! I did have to replace the pump
to carb fuel line. Not that difficult.
Thanks all!
Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Fallbrook, CA new email: B52Rule@Roadrunner.Com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Mike via
Gmclist
Sent: Saturday, March 21, 2020 9:56 PM
To: gmclist@list.gmcnet.org
Cc: Mike
Subject: Re: [GMCnet] onan fuel pump
Carl S. wrote on Sat, 21 March 2020 19:43
> I disassembled and cleaned my original pump several times and it still
would fail when it got hot. I finally replaced it with a Mr Gasket pump
> and had two failures on those as well. Bought a direct replacement Facet
from Applied and have had good luck with it, although it stopped working
> when hot one time last Summer. I'm considering relocating it outside of
the generator compartment so it doesn't get so hot.
The Mr. Gasket (#42S I think) one I had failed shortly after installation
too. It comes with a filter and where the two parts of the filter were
"crimped" together failed. The pump sucked air and died. If you use one,
don't use the filter that comes with it get a different one. I ended up
getting a Facet pump.
--
Mike K.
'75 PB
Southeast Michigan
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Len and Pat Novak
1978 GMC Kingsley
The Beast II with dash lights that work and labels you can see!
Las Vegas, NV new email: B52sRule@Gmail.com
http://www.gmcmhphotos.com/photos/showgallery.php?cat=4375
www.bdub.net/novak/
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