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| [GMCnet] Onan Not Starting... [message #166597] |
Tue, 17 April 2012 09:19  |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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Onan has a fuel primer with interior switch and that seems to work.
Jumped connectors 5 and 9 and can hear the whirl of the fuel pump. Last
time it didn't start may have been due to the < 1/4 tank but I'm at >
3/4 now. Generator will crank and crank but just doesn't want to fire
up. Thoughts?
Dan in NC
Caregiver to a 1976 Eleganza II
"Tzetze Fly"
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| Re: [GMCnet] Onan Not Starting... [message #166598 is a reply to message #166597] |
Tue, 17 April 2012 09:25  |
Dennis S
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| Kudzu wrote on Tue, 17 April 2012 09:19 |
Onan has a fuel primer with interior switch and that seems to work.
Jumped connectors 5 and 9 and can hear the whirl of the fuel pump. Last
time it didn't start may have been due to the < 1/4 tank but I'm at >
3/4 now. Generator will crank and crank but just doesn't want to fire
up. Thoughts?
Dan in NC
Caregiver to a 1976 Eleganza
|
Dan,
The pump is running -- is it pulling fuel? Recently had the fuel in my 4KW clog the filter. Pulled and cleaned the filter -- and then all was well.
Dennis
Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Onan Not Starting... [message #166600 is a reply to message #166598] |
Tue, 17 April 2012 09:31 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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It does sound fuel starved. I will check that. Just checking voltages
now. Stay tuned.
Dan in NC
Caregiver to a 1976 Eleganza II
"Tzetze Fly"
On 4/17/2012 10:25 AM, Dennis Sexton wrote:
>
> Kudzu wrote on Tue, 17 April 2012 09:19
>> Onan has a fuel primer with interior switch and that seems to work.
>> Jumped connectors 5 and 9 and can hear the whirl of the fuel pump. Last
>> time it didn't start may have been due to the< 1/4 tank but I'm at>
>> 3/4 now. Generator will crank and crank but just doesn't want to fire
>> up. Thoughts?
>>
>> Dan in NC
>> Caregiver to a 1976 Eleganza
>
> Dan,
> The pump is running -- is it pulling fuel? Recently had the fuel in my 4KW clog the filter. Pulled and cleaned the filter -- and then all was well.
>
> Dennis
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1999 Kawasaki Vulcan Nomad
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| Re: [GMCnet] Onan Not Starting... [message #166603 is a reply to message #166597] |
Tue, 17 April 2012 10:05 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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Voltages between 5 and 1, 8 and 1 and 10 and 1 all seem to be OK. I
disconnected the fuel line at the filter and it is all dry. So, I assume
it just isn't sucking in gas. I've uploaded a picture and have some
questions.
http://www.gmcmhphotos.com/photos/showphoto.php?photo=43877&title=onan-2c-by-crom&cat=6062
1. New fuel pump.
2. End of fuel line. Has the start of some splitting but it looks like
it is holding a seal - I'll replace it anyway.
3. Connection into the filter. Holding my finger over this, there is no
suction at all when cranking.
4. Choke? What position is full choke, should I be dinking with this
when trying to start?
5. Throttle. When I push this, the motor cranks faster but still doesn't
catch.
Thanks for any suggestions.
Dan in NC
Caregiver to a 1976 Eleganza II
"Tzetze Fly"
On 4/17/2012 10:19 AM, Daniel Jarvis wrote:
> Onan has a fuel primer with interior switch and that seems to work.
> Jumped connectors 5 and 9 and can hear the whirl of the fuel pump. Last
> time it didn't start may have been due to the< 1/4 tank but I'm at>
> 3/4 now. Generator will crank and crank but just doesn't want to fire
> up. Thoughts?
>
> Dan in NC
> Caregiver to a 1976 Eleganza II
> "Tzetze Fly"
>
> _______________________________________________
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> Unsubscribe or Change List Options:
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| Re: [GMCnet] Onan Not Starting... [message #166604 is a reply to message #166603] |
Tue, 17 April 2012 10:28 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
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""1. New fuel pump.
2. End of fuel line. Has the start of some splitting but it looks like
it is holding a seal - I'll replace it anyway.
3. Connection into the filter. Holding my finger over this, there is no
suction at all when cranking.
4. Choke? What position is full choke, should I be dinking with this
when trying to start?
5. Throttle. When I push this, the motor cranks faster but still doesn't
catch.
Thanks for any suggestions.
""
Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Onan Not Starting... [message #166605 is a reply to message #166604] |
Tue, 17 April 2012 10:32 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
don't think I hear it when it is cranking - hard to tell it is pretty
loud. I'll get under and see if something else has changed. It ran
before and other than gas level, nothing has changed. Thanks!
Dan in NC
Caregiver to a 1976 Eleganza II
"Tzetze Fly"
On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>
> ""1. New fuel pump.
> 2. End of fuel line. Has the start of some splitting but it looks like
> it is holding a seal - I'll replace it anyway.
> 3. Connection into the filter. Holding my finger over this, there is no
> suction at all when cranking.
> 4. Choke? What position is full choke, should I be dinking with this
> when trying to start?
> 5. Throttle. When I push this, the motor cranks faster but still doesn't
> catch.
>
> Thanks for any suggestions.
>
> ""
>
> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
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| Re: [GMCnet] Onan Not Starting... [message #166607 is a reply to message #166605] |
Tue, 17 April 2012 10:40 |
Dennis S
Messages: 3046
Registered: November 2005
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Dan,
Looks like you have a cube shaped fuel pump -- not the Facet up and down model that was original to the Onan. The original had a filter in the bottom.
So I would agree with Bob -- you may either have a major air leak or an obstruction in the line from the fuel tank to the pump.
With your current set-up -- jumping 5 and 9 you would have fuel coming from 2 in your picture.
Corrected typo ---- on numbers.
Dennis
| Kudzu wrote on Tue, 17 April 2012 10:32 |
When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
don't think I hear it when it is cranking - hard to tell it is pretty
loud. I'll get under and see if something else has changed. It ran
before and other than gas level, nothing has changed. Thanks!
Dan in NC
Caregiver to a 1976 Eleganza II
"Tzetze Fly"
On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>
> ""1. New fuel pump.
> 2. End of fuel line. Has the start of some splitting but it looks like
> it is holding a seal - I'll replace it anyway.
> 3. Connection into the filter. Holding my finger over this, there is no
> suction at all when cranking.
> 4. Choke? What position is full choke, should I be dinking with this
> when trying to start?
> 5. Throttle. When I push this, the motor cranks faster but still doesn't
> catch.
>
> Thanks for any suggestions.
>
> ""
>
> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
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Dennis S
73 Painted Desert 230
Memphis TN Metro
[Updated on: Tue, 17 April 2012 11:42] Report message to a moderator |
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| Re: [GMCnet] Onan Not Starting... [message #166616 is a reply to message #166607] |
Tue, 17 April 2012 11:30 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.
Sent from my iPhone!
On Apr 17, 2012, at 11:40 AM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>
>
> Dan,
>
> Looks like you have a cube shaped fuel pump -- not the Facet up and down model that was original to the Onan. The original had a filter in the bottom.
>
> So I would agree with Bob -- you may either have a major air leak or an obstruction in the line from the fuel tank to the pump.
>
> With your current set-up -- jumping 4 and 9 you would have fuel coming from 2 in your picture.
>
> Dennis
>
>
> Kudzu wrote on Tue, 17 April 2012 10:32
>> When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
>> don't think I hear it when it is cranking - hard to tell it is pretty
>> loud. I'll get under and see if something else has changed. It ran
>> before and other than gas level, nothing has changed. Thanks!
>>
>> Dan in NC
>> Caregiver to a 1976 Eleganza II
>> "Tzetze Fly"
>>
>> On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>>>
>>> ""1. New fuel pump.
>>> 2. End of fuel line. Has the start of some splitting but it looks like
>>> it is holding a seal - I'll replace it anyway.
>>> 3. Connection into the filter. Holding my finger over this, there is no
>>> suction at all when cranking.
>>> 4. Choke? What position is full choke, should I be dinking with this
>>> when trying to start?
>>> 5. Throttle. When I push this, the motor cranks faster but still doesn't
>>> catch.
>>>
>>> Thanks for any suggestions.
>>>
>>> ""
>>>
>>> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
>> _______________________________________________
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>
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
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1996 Chevy Impala SS
1999 Kawasaki Vulcan Nomad
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| Re: [GMCnet] Onan Not Starting... [message #166619 is a reply to message #166616] |
Tue, 17 April 2012 11:40 |
mickeysss
Messages: 1476
Registered: January 2012
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If the fuel is lower than /14 of a tank or so the reservoir hose to the onan will not take gas to save the gmc from running out of gas
complete. So make sure you rear tank is full or above 1/2 to get gas to the onan.
On Apr 17, 2012, at 9:30 AM, Daniel Jarvis wrote:
> Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.
>
> Sent from my iPhone!
>
> On Apr 17, 2012, at 11:40 AM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>
>>
>>
>> Dan,
>>
>> Looks like you have a cube shaped fuel pump -- not the Facet up and down model that was original to the Onan. The original had a filter in the bottom.
>>
>> So I would agree with Bob -- you may either have a major air leak or an obstruction in the line from the fuel tank to the pump.
>>
>> With your current set-up -- jumping 4 and 9 you would have fuel coming from 2 in your picture.
>>
>> Dennis
>>
>>
>> Kudzu wrote on Tue, 17 April 2012 10:32
>>> When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
>>> don't think I hear it when it is cranking - hard to tell it is pretty
>>> loud. I'll get under and see if something else has changed. It ran
>>> before and other than gas level, nothing has changed. Thanks!
>>>
>>> Dan in NC
>>> Caregiver to a 1976 Eleganza II
>>> "Tzetze Fly"
>>>
>>> On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>>>>
>>>> ""1. New fuel pump.
>>>> 2. End of fuel line. Has the start of some splitting but it looks like
>>>> it is holding a seal - I'll replace it anyway.
>>>> 3. Connection into the filter. Holding my finger over this, there is no
>>>> suction at all when cranking.
>>>> 4. Choke? What position is full choke, should I be dinking with this
>>>> when trying to start?
>>>> 5. Throttle. When I push this, the motor cranks faster but still doesn't
>>>> catch.
>>>>
>>>> Thanks for any suggestions.
>>>>
>>>> ""
>>>>
>>>> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>>
>> --
>> Dennis S
>> 73 Painted Desert 230
>> Germantown, TN
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| Re: [GMCnet] Onan Not Starting... [message #166620 is a reply to message #166616] |
Tue, 17 April 2012 11:41 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Yes, should read 5 and 9 -- typo..
Obstruction or leak between pump and tank.
Or an obstruction within the pump -- such as, varnish ir gum within the pump.
Dennie
| Kudzu wrote on Tue, 17 April 2012 11:30 |
Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.
Sent from my iPhone!
On Apr 17, 2012, at 11:40 AM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>
>
> Dan,
>
> Looks like you have a cube shaped fuel pump -- not the Facet up and down model that was original to the Onan. The original had a filter in the bottom.
>
> So I would agree with Bob -- you may either have a major air leak or an obstruction in the line from the fuel tank to the pump.
>
> With your current set-up -- jumping 4 and 9 you would have fuel coming from 2 in your picture.
>
> Dennis
>
>
> Kudzu wrote on Tue, 17 April 2012 10:32
>> When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
>> don't think I hear it when it is cranking - hard to tell it is pretty
>> loud. I'll get under and see if something else has changed. It ran
>> before and other than gas level, nothing has changed. Thanks!
>>
>> Dan in NC
>> Caregiver to a 1976 Eleganza II
>> "Tzetze Fly"
>>
>> On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>>>
>>> ""1. New fuel pump.
>>> 2. End of fuel line. Has the start of some splitting but it looks like
>>> it is holding a seal - I'll replace it anyway.
>>> 3. Connection into the filter. Holding my finger over this, there is no
>>> suction at all when cranking.
>>> 4. Choke? What position is full choke, should I be dinking with this
>>> when trying to start?
>>> 5. Throttle. When I push this, the motor cranks faster but still doesn't
>>> catch.
>>>
>>> Thanks for any suggestions.
>>>
>>> ""
>>>
>>> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
>
> --
> Dennis S
> 73 Painted Desert 230
> Germantown, TN
> _______________________________________________
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Onan Not Starting... [message #166621 is a reply to message #166616] |
Tue, 17 April 2012 11:46 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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""Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.""
That clicking just above the circuit board worries me a bit. The fuel pump is on the other side of the engine from the circuit board. Maybe you should put your hand on the pump to make sure that is what you hear clicking.
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Onan Not Starting... [message #166623 is a reply to message #166616] |
Tue, 17 April 2012 11:54 |
roy1
Messages: 2126
Registered: July 2004
Location: Minden nevada
Karma: 6
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Is the electric solonoid ahead of the pump bad? Why don't you disconnect the pump inlet and use a temporary hose in a can of gas with the hose connected to the pump inlet to see if the pump is bad.
Roy Keen
Minden,NV
76 X Glenbrook
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| Re: [GMCnet] Onan Not Starting... [message #166625 is a reply to message #166603] |
Tue, 17 April 2012 12:26 |
 |
mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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I am assuming the numbers in the pitcure match the numbers below:
<http://www.gmcmhphotos.com/photos/showphoto.php?photo=43877>
>> 1. New fuel pump.
-- Has it ever ran with this pump? As it is square I assume it is NOT an Onan pump. Is there a filter on the suction side of the pump? These little square pumps are easy to install backwards and do not work that way.
>> 2. End of fuel line. Has the start of some splitting but
>> it looks like it is holding a seal - I'll replace it anyway.
-- Looks dry... as in no fuel. This area should be under pressure when operating correctly. Make sure it seals "really good."
>> 3. Connection into the filter. Holding my finger over this, there is no suction at all when cranking.
-- This is the connection into the carburetor... output of the pump.
>> 4. Choke? What position is full choke, should I be dinking
>> with this when trying to start?
-- The engine is cold and you are trying to start. it should go fully closed when cranking and half closed when not cranking. remember that this engine starts with full-open throttle.
>> 5. Throttle. When I push this, the motor cranks faster but
>> still doesn't catch.
-- As when you push on "this" you are closing the throttle, I do not understand why it would crank faster... 
What I would do:
I know many do not like using starting fluid, but I use it to divide, the problem in half. I disconnect the breather hose (between 2 and 3 in your picture) and spray a SMALL amount into the intake side of the carb. Then crank. If the motor fires I know that the "electrical" side is working and move on to the "fuel" side of the problem.
Let us know what you find. (With the dry hose, I suspect you have a problem on the fuel side. look into a small fuel can... something like a outboard motor boat tank would be best.)
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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| Re: [GMCnet] Onan Not Starting... [message #166628 is a reply to message #166621] |
Tue, 17 April 2012 13:02 |
William Cornell
Messages: 8
Registered: February 2012
Karma: 0
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Junior Member |
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Just a thought from a sideline observer:
To check the fuel supply run a 12 volt jumper from the Battery + terminal to the fuel pump. If it pumps fuel the problem is somewhere else.
Bill Cornell
________________________________
From: Bob de Kruyff <NEXT2POOL@AOL.COM>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, April 17, 2012 12:46 PM
Subject: Re: [GMCnet] Onan Not Starting...
""Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.""
That clicking just above the circuit board worries me a bit. The fuel pump is on the other side of the engine from the circuit board. Maybe you should put your hand on the pump to make sure that is what you hear clicking.
--
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Onan Not Starting... [message #166631 is a reply to message #166623] |
Tue, 17 April 2012 13:14 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
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I am not sir about the solenoid. I have a marine tank (used it as an auxiliary on the motorcycle) that I will use to test that. Thanks!
Sent from my iPhone!
On Apr 17, 2012, at 12:54 PM, roy@gmcnet.org wrote:
>
>
> Is the electric solonoid ahead of the pump bad? Why don't you disconnect the pump inlet and use a temporary hose in a can of gas with the hose connected to the pump inlet to see if the pump is bad.
> --
> Roy Keen
> Minden,NV
> 76 X Glenbrook
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1976 Eleganza II
1996 Chevy Impala SS
1999 Kawasaki Vulcan Nomad
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| Re: [GMCnet] Onan Not Starting... [message #166632 is a reply to message #166619] |
Tue, 17 April 2012 13:17 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
Karma: 0
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Senior Member |
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Yep, that's what happened last time. Earlier it was at 3/4 but now it's full and issue persists. I'll try gravity fed gas next. I took the coach back to storage as the HOA (and neighbors) can only appreciate the sight of the GMC in my driveway for only so long. But I can do this test off-site. Thanks!
Sent from my iPhone!
On Apr 17, 2012, at 12:40 PM, mickey's space ship shuttle <mickeysss@me.com> wrote:
> If the fuel is lower than /14 of a tank or so the reservoir hose to the onan will not take gas to save the gmc from running out of gas
>
> complete. So make sure you rear tank is full or above 1/2 to get gas to the onan.
>
>
>
>
> On Apr 17, 2012, at 9:30 AM, Daniel Jarvis wrote:
>
>> Do you mean 5 and 9? I jump them and hear the pump or at least a rapid clicking just above the circuit board. Nothing coming out of the hose. The hose itself seems uninstructed, so maybe it is an air leak somewhere. From the fuel tank to the genny is all new.
>>
>> Sent from my iPhone!
>>
>> On Apr 17, 2012, at 11:40 AM, Dennis Sexton <dennisfsexton@aol.com> wrote:
>>
>>>
>>>
>>> Dan,
>>>
>>> Looks like you have a cube shaped fuel pump -- not the Facet up and down model that was original to the Onan. The original had a filter in the bottom.
>>>
>>> So I would agree with Bob -- you may either have a major air leak or an obstruction in the line from the fuel tank to the pump.
>>>
>>> With your current set-up -- jumping 4 and 9 you would have fuel coming from 2 in your picture.
>>>
>>> Dennis
>>>
>>>
>>> Kudzu wrote on Tue, 17 April 2012 10:32
>>>> When I jump 5 and 9, I can hear the pump clicking/whirling, yes. But I
>>>> don't think I hear it when it is cranking - hard to tell it is pretty
>>>> loud. I'll get under and see if something else has changed. It ran
>>>> before and other than gas level, nothing has changed. Thanks!
>>>>
>>>> Dan in NC
>>>> Caregiver to a 1976 Eleganza II
>>>> "Tzetze Fly"
>>>>
>>>> On 4/17/2012 11:28 AM, Bob de Kruyff wrote:
>>>>>
>>>>> ""1. New fuel pump.
>>>>> 2. End of fuel line. Has the start of some splitting but it looks like
>>>>> it is holding a seal - I'll replace it anyway.
>>>>> 3. Connection into the filter. Holding my finger over this, there is no
>>>>> suction at all when cranking.
>>>>> 4. Choke? What position is full choke, should I be dinking with this
>>>>> when trying to start?
>>>>> 5. Throttle. When I push this, the motor cranks faster but still doesn't
>>>>> catch.
>>>>>
>>>>> Thanks for any suggestions.
>>>>>
>>>>> ""
>>>>>
>>>>> Sure sounds like lack of fuel. The number 3 on your picture is the input to the carburetor so you shouldn't expect suction but rather some pressure. I believe the choke is closed by rotating it counter clockwise and you can play with that a bit but yiou should have fuel spurting out of the hose end number 2. I wouldn't fool with the throttle. I'm guessing your input to the fuel pump is restricted or sucking air--it's not visible in your picture. That line runs from the fuel pump, down through a fitting in the floor or bottom of the the metal housing that is bolted to the frame. From there it goes to the fuel tank. I would look all of that over closely. Can you hear the pump clicking?
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>>>
>>> --
>>> Dennis S
>>> 73 Painted Desert 230
>>> Germantown, TN
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1976 Eleganza II
1996 Chevy Impala SS
1999 Kawasaki Vulcan Nomad
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| Re: [GMCnet] Onan Not Starting... [message #166633 is a reply to message #166623] |
Tue, 17 April 2012 13:26 |
Bob de Kruyff
Messages: 4260
Registered: January 2004
Location: Chandler, AZ
Karma: 1
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Senior Member |
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| roy1 wrote on Tue, 17 April 2012 10:54 |
Is the electric solonoid ahead of the pump bad? Why don't you disconnect the pump inlet and use a temporary hose in a can of gas with the hose connected to the pump inlet to see if the pump is bad.
|
Good catch--I forgot all about that one-assuming it's still on there !
Bob de Kruyff
78 Eleganza
Chandler, AZ
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| Re: [GMCnet] Onan Not Starting... [message #166653 is a reply to message #166597] |
Tue, 17 April 2012 17:36 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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These pumps do not like pumping from an dry line. If you run the tank to low and also open up the line all of the gas int he hose to the tank will run back into the tank. Then the next time the pump starts to run it has no gas line the line and it will not pump.
The following takes two people.
1. Remove the gas line from the input to the pump.
2. Remove the gas fill cap.
3. Apply a little air pressure to the tank using an air compressor and a rag.
4. When gas starts coming out of the hose immediately attach the hose to the input of the pump.
5. Remove the air pressure.
6. Replace the gas cap.
7. Start the Onan.
An alternate method is to jumper 5 to 9 and then apply air pressure to the tank to assist the initial flow of gas to the pump.
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan Not Starting... [message #166654 is a reply to message #166653] |
Tue, 17 April 2012 17:38 |
Ken Burton
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
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Senior Member |
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| Ken Burton wrote on Tue, 17 April 2012 17:36 |
These pumps do not like pumping from an dry line. If you run the tank to low and also open up the line all of the gas int he hose to the tank will run back into the tank. Then the next time the pump starts to run it has no gas line the line and it will not pump.
The following takes two people.
1. Remove the gas line from the input to the pump.
2. Remove the gas fill cap.
3. Apply a little air pressure to the tank using an air compressor and a rag.
4. When gas starts coming out of the hose immediately attach the hose to the input of the pump.
5. Remove the air pressure.
6. Replace the gas cap.
7. Start the Onan.
An alternate method is to jumper 5 to 9 and then apply air pressure to the tank to assist the initial flow of gas to the pump.
|
Note: You only need to apply the air pressure for less than 5 seconds at a time
Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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| Re: [GMCnet] Onan Not Starting... [message #166681 is a reply to message #166625] |
Tue, 17 April 2012 23:43 |
Kudzu
Messages: 377
Registered: November 2011
Location: Marshville, NC
Karma: 0
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Senior Member |
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1. Yes.
2. Tried again, nada. Going to replace that hose.
3.
4. It doesn't move on it's own at all during cranking - no suction?
5. Maybe it's sitting closed and I am pushing it to WOT?
I'll try the boost.
Thanks!
On 4/17/2012 1:26 PM, Mike Miller wrote:
>
> I am assuming the numbers in the pitcure match the numbers below:
> <http://www.gmcmhphotos.com/photos/showphoto.php?photo=43877>
>
>>> 1. New fuel pump.
> -- Has it ever ran with this pump? As it is square I assume it is NOT an Onan pump. Is there a filter on the suction side of the pump? These little square pumps are easy to install backwards and do not work that way.
>
>>> 2. End of fuel line. Has the start of some splitting but
>>> it looks like it is holding a seal - I'll replace it anyway.
> -- Looks dry... as in no fuel. This area should be under pressure when operating correctly. Make sure it seals "really good."
>
>>> 3. Connection into the filter. Holding my finger over this, there is no suction at all when cranking.
> -- This is the connection into the carburetor... output of the pump.
>
>>> 4. Choke? What position is full choke, should I be dinking
>>> with this when trying to start?
> -- The engine is cold and you are trying to start. it should go fully closed when cranking and half closed when not cranking. remember that this engine starts with full-open throttle.
>
>>> 5. Throttle. When I push this, the motor cranks faster but
>>> still doesn't catch.
> -- As when you push on "this" you are closing the throttle, I do not understand why it would crank faster... :?
>
> What I would do:
>
> I know many do not like using starting fluid, but I use it to divide, the problem in half. I disconnect the breather hose (between 2 and 3 in your picture) and spray a SMALL amount into the intake side of the carb. Then crank. If the motor fires I know that the "electrical" side is working and move on to the "fuel" side of the problem.
>
> Let us know what you find. (With the dry hose, I suspect you have a problem on the fuel side. look into a small fuel can... something like a outboard motor boat tank would be best.)
>
>
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1999 Kawasaki Vulcan Nomad
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