Home » Public Forums » GMCnet » [GMCnet] I give up. (Onan)
|
|
| Re: [GMCnet] I give up. (Onan) [message #187969 is a reply to message #187967] |
Mon, 22 October 2012 11:10   |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
|
Senior Member |
|
|
Well, Robin, I'd say the lawn tractor battery
SHOULD be adequate to start a FUNCTIONAL Onan!
However, I suspect you've been cranking for a
whole bunch of minutes and that would take it
down, for sure. If you have a spare auto
battery available, I would advise using that
to crank the Onan until you get it sorted out.
Several folks have given you some advice
regarding "repair" or "recondition" of the
Onan fuel pump. There is reportedly a small
electric fuel pump in blister pack at auto
stores like O'Reilly, AutoZone, Advanced, etc.
that is around $50 that should do just fine.
Our ham radio club has a cantankerous genset
with a fuel pump problem and I need to buy
that pump before next year's Field Day!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Mon, 22 Oct 2012 10:51:46 -0500
> From: loxley@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] I give up. (Onan)
>
> Thanks, Mac. :)
>
> Quite likely I was making extra work for myself. I'm starting over
> from square one tonight when I get home.
>
> The little lawn tractor battery is good for an unknown number of
> cranking amps... probably not all that many since it hasn't been on
> the charger since I started messing with the generator. It does turn
> the genny over just fine, although it's gotten a bit slow. I'll put
> the battery on my charger when I get home so it can be charging as I'm
> putting together my workbench.
>
> I've lost my jumper wires (alligator clips) in the move. I need to buy
> some alligator clip multimeter leads from RadShack anyway. Video
> tonight.
>
> On 10/22/12, D C _Mac_ Macdonald <k2gkk@hotmail.com> wrote:
> >
> > What are you trying to run/start with the 50A supply?
> >
> > I don't believe that there is any way the starter for the
> > Onan should draw that much current! A motorcycle
> > battery for a Harley or other large bike should easily
> > spin the starter for the Onan.
> >
> > Ken Burton's estimate for current draw for the Onan fuel
> > pump is likely to be pessimistic!
> >
> > I think you are making unnecessary work for yourself
> > until you get the fuel pump straightened out.
> >
> --
> Robin Hood
> Jackson, MS
> 2003 Buick Lesabre
> 1968 Pontiac Catalina
> 1978 GMC Royale motorhome
> 1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #187971 is a reply to message #187936] |
Mon, 22 October 2012 11:47 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| Ken Burton wrote on Sun, 21 October 2012 20:29 |
...
On your low voltage when cranking. You stated that you have a 50 amp power supply. I think that the starter draws more that 50 amps exceeding the capacity of your supply so the voltage is dropping when cranking. ...
|
My Birch is wired to start the Onan through two 50 amp circuit breakers and a long cable to the rear. Also carried on the same breaker/cable/breaker assembly is all the house 12v circuit loads. It still cranks just fine even with the house loads at the same time. So... I'd say the 50 amp charger should have enough amps to crank the Onan without much voltage drop. (Now if the motor was bigger, 50 amps might not be enough.)
| Robin Hood wrote on Mon, 22 October 2012 05:16 |
...
Then I'll take the pump loose and see what I can do about it, hooking it up to the battery once it's off the Onan just to see what happens, and try to take it apart to clean it up, see if I can make it go.
Regardless of what other problems the Onan may or may not have, fuel delivery is the most basic and most straightforward to look at.
...
|
That's it. Break it down into smaller problems and fix them one at a time.
It needs compression/fuel/spark (at the right time) to run. What is the most important leg of a three legged stool? The leg that is missing!
Actually I think you are missing two legs... (fuel and spark)
While I'd use starting fluid to work on getting the spark, most would concentrate on the fuel issue.
SO... Start with the pump. it is simple enough to to give you experience disassembling cleaning and reassembling. You might need it as if your fuel pump is gummed up from old gas, it would not surprise me that the carb will need cleaned also. But that is getting ahead in the "one problem at a time trouble shooting method" we need to keep... just to keep thing simple.
Keep plugging along, I expect you to have learned how small engines work by the time you are done. This could be knowledge that could come in handy in the future... this is something you'll never get if you have someone else fix it.
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
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #187977 is a reply to message #187967] |
Mon, 22 October 2012 12:07 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
|
Senior Member |
|
|
I have to replace the shop stock of jumper clips every few months. I never realized why until I was grousing about not having enough one day. One of the jocks sidled up and said "You know, they make excellent emergency roach clips". Such is life in the Radio Game.
--johnny
'76 23' transmode norris
'76 palm beach
From: Robin Hood <loxley@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Monday, October 22, 2012 11:51 AM
Subject: Re: [GMCnet] I give up. (Onan)
Thanks, Mac. :)
Quite likely I was making extra work for myself. I'm starting over
from square one tonight when I get home.
The little lawn tractor battery is good for an unknown number of
cranking amps... probably not all that many since it hasn't been on
the charger since I started messing with the generator. It does turn
the genny over just fine, although it's gotten a bit slow. I'll put
the battery on my charger when I get home so it can be charging as I'm
putting together my workbench.
I've lost my jumper wires (alligator clips) in the move. I need to buy
some alligator clip multimeter leads from RadShack anyway. Video
tonight.
On 10/22/12, D C _Mac_ Macdonald <k2gkk@hotmail.com> wrote:
>
> What are you trying to run/start with the 50A supply?
>
> I don't believe that there is any way the starter for the
> Onan should draw that much current! A motorcycle
> battery for a Harley or other large bike should easily
> spin the starter for the Onan.
>
> Ken Burton's estimate for current draw for the Onan fuel
> pump is likely to be pessimistic!
>
> I think you are making unnecessary work for yourself
> until you get the fuel pump straightened out.
>
--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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
|
|
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188058 is a reply to message #188015] |
Tue, 23 October 2012 17:05 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
|
Senior Member |
|
|
Tom Phipps came by today. I had just finished reinforcing my cheapass
workbench into something that hopefully wouldn't kill us.
We determined that there is spark at the plugs and that the fuel pump was
bad bad bad.
We replaced the fuel pump with a low pressure Facet pump from NAPA.
That's as far as we got. There was also considerable running around for
this or that, but it was time well spent on a beautiful day.
Too tired to shoot a video.
Next comes cleaning up the carb, and picking up a gap measuring tool for
the plugs.
Many many MANY mad props go out to T. Pizzle, yo, for helping me out.
For now though, the ibuprofen and ethanol (already in progress) are calling
with their sweet sweet siren song...
On Monday, October 22, 2012, Robin Hood wrote:
> Ok, so here is how my workbench worked out.
>
> http://youtu.be/WNTgf2Pcq_E
>
> Tom Phipps says he's coming tomorrow to play Onan with me. He may
> change his mind after watching this video.
>
>
> --
> Robin Hood
> Jackson, MS
> 2003 Buick Lesabre
> 1968 Pontiac Catalina
> 1978 GMC Royale motorhome
> 1977 GMC Palm Beach motorhome
>
--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188060 is a reply to message #188058] |
Tue, 23 October 2012 17:20 |
k2gkk
Messages: 4452
Registered: November 2009
Karma: -8
|
Senior Member |
|
|
I don't think ibuprofen and ethanol together are a good thing, Robin!
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
~~ ~ D C "Mac" Macdonald ~ ~~
~ ~ Amateur Radio - K2GKK ~ ~
~ ~ USAF and FAA, Retired ~ ~
~ ~ ~ Oklahoma City, OK ~ ~ ~
~~ ~ ~ "The Money Pit" ~ ~ ~~
~ ~ ~ ~ TZE166V101966 ~ ~ ~ ~
~ ~ ~ '76 ex-Palm Beach ~ ~ ~
~ www.gmcmhphotos.com/okclb ~
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
______________
*[ ]~~~[][ ][|\
*--OO--[]---O-*
> Date: Tue, 23 Oct 2012 17:05:02 -0500
> From: loxley@gmail.com
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] I give up. (Onan)
>
> Tom Phipps came by today. I had just finished reinforcing my cheapass
> workbench into something that hopefully wouldn't kill us.
>
> We determined that there is spark at the plugs and that the fuel pump was
> bad bad bad.
>
> We replaced the fuel pump with a low pressure Facet pump from NAPA.
>
> That's as far as we got. There was also considerable running around for
> this or that, but it was time well spent on a beautiful day.
>
> Too tired to shoot a video.
>
> Next comes cleaning up the carb, and picking up a gap measuring tool for
> the plugs.
>
> Many many MANY mad props go out to T. Pizzle, yo, for helping me out.
>
> For now though, the ibuprofen and ethanol (already in progress) are calling
> with their sweet sweet siren song...
>
> --
> Robin Hood
> Jackson, MS
> 2003 Buick Lesabre
> 1968 Pontiac Catalina
> 1978 GMC Royale motorhome
> 1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188064 is a reply to message #187966] |
Tue, 23 October 2012 18:22 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
|
Senior Member |
|
|
Worked on Robin's Onan most of the day.
First, badly oiled spark plugs. Replace plugs and was rewarded with spark, weak as expected with the Onan.
Second, noticed fuel pump not running, and very warm/hot to the touch. Spent some time and several trips to parts house replacing the OEM fuel pump. Rewarded with pump sounds and fuel flow.
Third, no apparent gas smell in the combustion chamber ( removed spark plug and sniffed for gas). Ran out of time, but definitely needs carb cleaning. Carb kit would be nice.
And another trip to be planned.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
|
|
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188156 is a reply to message #188148] |
Wed, 24 October 2012 21:10 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
| Robin Hood wrote on Wed, 24 October 2012 18:44 |
Further Onan follies! Now with video!
http://www.youtube.com/watch?v=my9qBM7ZkDU
Shouldn't my bowl be full of fuel?
Also, which two wires on the voltage regulator get tied together?
--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
You are correct there should be gas in the bowl if the float isn't stuck and the needle valve is clear. You do have the out of the pump connected to the carb right?
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188171 is a reply to message #188148] |
Thu, 25 October 2012 01:11 |
|
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
If working correctly, the pump should pump (it is) until the float bowl is filled and the needle valve shuts off the flow. the pump should then slow to a stop.
As it is pumping but not every stopping without gas pouring out of the carb... I'd say the pump is not pumping.
Is it connected correctly? (in/out and 12v/ground.)
I THINK some kinds of pumps with pump a bit when powered backwards....
OBTW: You forgot to put the clamp back on the upper connection of the pressurized fuel line at the carb... but did not get even seepage. (Also points to fuel pump not pumping.)
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
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188177 is a reply to message #188171] |
Thu, 25 October 2012 07:26 |
Robin Hood
Messages: 1078
Registered: April 2011
Karma: 3
|
Senior Member |
|
|
Why would the pump slow all the way to a stop? I mean, is there some
sort of sensor or logic in there that somehow lets the pump know "Hey,
the bowl is full and the float is blocking any more fuel coming in,
you can stop trying so hard now, okay?"
I've been operating under the impression that fuel pumps run at all
times, and that it's up to the floats in the carbs to control how much
of that fuel actually goes into the carbs.
For sure it's connected properly, and it works: I even unhooked the
pump from the carb and hooked up power and watched it pee fuel onto my
garage floor.
I can hold the carb up to my mouth and blow into the fuel inlet with
the float hanging down. If I lift up on the float, simulating it
floating in a bowl full of sweet sweet gasoline, it blocks off
something and I can't blow through it anymore.
It's behaving as if, the float is stuck in the "up" blocked position,
preventing fuel from entering the carb at all. I don't think the bowl
is interfering with the float, and the float certainly seems to move
up and down freely.
I'm going to put some more gas in my fuel can, to make absolutely sure
that the end of my fuel line is drawing fuel instead of air. Then i'll
take the carb off again and see if the bowl fills, and if not, see if
taking the bowl off changes anything; that will tell me I've got
something going on with my float.
There was no seepage around the unclamped hose that I just stuck onto
the carb fuel inlet, and there was no fuel coming out of the carb.
I'll play with it some more when i get home.
On 10/25/12, Mike Miller <m000035@gmail.com> wrote:
>
>
> Robin Hood wrote on Wed, 24 October 2012 18:44
>> Further Onan follies! Now with video!
>>
>> http://www.youtube.com/watch?v=my9qBM7ZkDU
>>
>> Shouldn't my bowl be full of fuel?
>
>
> If working correctly, the pump should pump (it is) until the float bowl is
> filled and the needle valve shuts off the flow. the pump should then slow
> to a stop.
>
> As it is pumping but not every stopping without gas pouring out of the
> carb... I'd say the pump is not pumping.
>
> Is it connected correctly? (in/out and 12v/ground.)
>
> I THINK some kinds of pumps with pump a bit when powered backwards....
>
> OBTW: You forgot to put the clamp back on the upper connection of the
> pressurized fuel line at the carb... but did not get even seepage. (Also
> points to fuel pump not pumping.)
>
>
>
>
> --
> Mike Miller -- Hillsboro, OR -- on the Black list
> (#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23'
> Birchaven Side Bath
> http://m000035.blogspot.com
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188188 is a reply to message #188177] |
Thu, 25 October 2012 09:05 |
 |
Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
|
Senior Member |
|
|
Robin,
I hate doing it this way, but it will be clearer. I didn't have time for 11+ minutes of youtube - sorry.
| Robin Hood wrote on Thu, 25 October 2012 08:26 |
Why would the pump slow all the way to a stop? I mean, is there some sort of sensor or logic in there that somehow lets the pump know "Hey, the bowl is full and the float is blocking any more fuel coming in, you can stop trying so hard now, okay?"
|
No, the pump is internally leaky. So, it pumps a bit of fuel and even if it does not get used, the pump's piston gets pushed back by the spring and it does another stroke.
| Quote: |
I've been operating under the impression that fuel pumps run at all times, and that it's up to the floats in the carbs to control how much of that fuel actually goes into the carbs.
|
That is correct.
| Quote: |
For sure it's connected properly, and it works: I even unhooked the pump from the carb and hooked up power and watched it pee fuel onto my garage floor.
|
That was another good test, but when you try this again,plug the gas line with a finger. The pump should go into slow pump mode.
| Quote: |
I can hold the carb up to my mouth and blow into the fuel inlet with the float hanging down. If I lift up on the float, simulating it floating in a bowl full of sweet sweet gasoline, it blocks off something and I can't blow through it anymore.
|
That is another very good test.| Quote: |
It's behaving as if, the float is stuck in the "up" blocked position, preventing fuel from entering the carb at all. I don't think the bowl is interfering with the float, and the float certainly seems to move up and down freely.
|
If you can't figure it out. Try the blow in to fuel inlet with the carburetor loose. Then turn it upside down and see if it shuts off. I have cases where the assembled parts do not behave correctly. | Quote: |
I'm going to put some more gas in my fuel can, to make absolutely sure that the end of my fuel line is drawing fuel instead of air. Then i'll take the carb off again and see if the bowl fills, and if not, see if taking the bowl off changes anything; that will tell me I've got something going on with my float.
|
That is a real good plan. Your analysis and thought processes are going to be a great asset.
| Quote: |
There was no seepage around the unclamped hose that I just stuck onto the carb fuel inlet, and there was no fuel coming out of the carb.
--
Robin Hood
|
good luck guy -
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
|
|
|
|
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188196 is a reply to message #188192] |
Thu, 25 October 2012 09:55 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
Karma: 13
|
Senior Member |
|
|
Robin,
It's possible that you don't have the float/needle assembly installed right. When doing your 'blow in the inlet' test, do you have the bowl installed? If not, the float may be dropping enough to open the needle valve, but when you install the bowl, it could be pushing the float up high enough to close it off. Re-check the interface between the float and the needle. Make sure the needle in in the right position in that little bracket. That could be the problem, or maybe it's just a float adjustment that's needed.
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
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188203 is a reply to message #188177] |
Thu, 25 October 2012 10:45 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
|
Senior Member |
|
|
Robin,
I had a problem with the screen in the float bowl. When float bowl off the float worked as you describe. When assembled the screen was not allowing the float to drop and let fuel in. So to echo last post check operation of float with carb assembled.
Sully
77royale
Seattle
Sent from my iPhone
On Oct 25, 2012, at 5:26 AM, Robin Hood <loxley@gmail.com> wrote:
> Why would the pump slow all the way to a stop? I mean, is there some
> sort of sensor or logic in there that somehow lets the pump know "Hey,
> the bowl is full and the float is blocking any more fuel coming in,
> you can stop trying so hard now, okay?"
>
> I've been operating under the impression that fuel pumps run at all
> times, and that it's up to the floats in the carbs to control how much
> of that fuel actually goes into the carbs.
>
> For sure it's connected properly, and it works: I even unhooked the
> pump from the carb and hooked up power and watched it pee fuel onto my
> garage floor.
>
> I can hold the carb up to my mouth and blow into the fuel inlet with
> the float hanging down. If I lift up on the float, simulating it
> floating in a bowl full of sweet sweet gasoline, it blocks off
> something and I can't blow through it anymore.
>
> It's behaving as if, the float is stuck in the "up" blocked position,
> preventing fuel from entering the carb at all. I don't think the bowl
> is interfering with the float, and the float certainly seems to move
> up and down freely.
>
> I'm going to put some more gas in my fuel can, to make absolutely sure
> that the end of my fuel line is drawing fuel instead of air. Then i'll
> take the carb off again and see if the bowl fills, and if not, see if
> taking the bowl off changes anything; that will tell me I've got
> something going on with my float.
>
> There was no seepage around the unclamped hose that I just stuck onto
> the carb fuel inlet, and there was no fuel coming out of the carb.
>
> I'll play with it some more when i get home.
>
> On 10/25/12, Mike Miller <m000035@gmail.com> wrote:
>>
>>
>> Robin Hood wrote on Wed, 24 October 2012 18:44
>>> Further Onan follies! Now with video!
>>>
>>> http://www.youtube.com/watch?v=my9qBM7ZkDU
>>>
>>> Shouldn't my bowl be full of fuel?
>>
>>
>> If working correctly, the pump should pump (it is) until the float bowl is
>> filled and the needle valve shuts off the flow. the pump should then slow
>> to a stop.
>>
>> As it is pumping but not every stopping without gas pouring out of the
>> carb... I'd say the pump is not pumping.
>>
>> Is it connected correctly? (in/out and 12v/ground.)
>>
>> I THINK some kinds of pumps with pump a bit when powered backwards....
>>
>> OBTW: You forgot to put the clamp back on the upper connection of the
>> pressurized fuel line at the carb... but did not get even seepage. (Also
>> points to fuel pump not pumping.)
>>
>>
>>
>>
>> --
>> Mike Miller -- Hillsboro, OR -- on the Black list
>> (#1)'73 26' exPainted D. -- (#2)`78 23' Birchaven Rear Bath -- (#3)`77 23'
>> Birchaven Side Bath
>> http://m000035.blogspot.com
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> Robin Hood
> Jackson, MS
> 2003 Buick Lesabre
> 1968 Pontiac Catalina
> 1978 GMC Royale motorhome
> 1977 GMC Palm Beach motorhome
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188204 is a reply to message #188196] |
Thu, 25 October 2012 10:54 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
|
Senior Member |
|
|
| Carl S. wrote on Thu, 25 October 2012 07:55 |
Robin,
It's possible that you don't have the float/needle assembly installed right. When doing your 'blow in the inlet' test, do you have the bowl installed? If not, the float may be dropping enough to open the needle valve, but when you install the bowl, it could be pushing the float up high enough to close it off. Re-check the interface between the float and the needle. Make sure the needle in in the right position in that little bracket. That could be the problem, or maybe it's just a float adjustment that's needed.
|
Good idea Robin make sure the float is at the factory recomended setting.
Roy Keen
Minden,NV
76 X Glenbrook
|
|
|
|
| Re: [GMCnet] I give up. (Onan) [message #188206 is a reply to message #188177] |
Thu, 25 October 2012 11:10 |
|
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
|
Senior Member |
|
|
| Robin Hood wrote on Thu, 25 October 2012 05:26 |
Why would the pump slow all the way to a stop? I mean, is there some
sort of sensor or logic in there that somehow lets the pump know "Hey,
the bowl is full and the float is blocking any more fuel coming in,
you can stop trying so hard now, okay?" ...
|
I do not know about the non-Onan pump that you now have. It might be different than the "real" Onan pumps on all three of mine and the dozen or so I have worked on.
BUT....
Onan type fuel pumps will make the clicking sound until the line and float bowl are full and the valve closes. Then it builds pressure in the line, slowing the pumping action. Eventually the pressure is to much for the pump and it stops. This happens when I press the added "prime" button or jump the board.
As your pump never even changes pitch or tempo I do not believe it is pumping anything. I might be wrong, but YOUR Onan doesn't run... mine does. 
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
|
|
|
|
Goto Forum:
Current Time: Fri Sep 27 12:08:48 CDT 2024
Total time taken to generate the page: 0.01950 seconds
|
GMCforum
Search
Help
Register
Login
Home
