GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » [GMCnet] Onan Not Starting...
Re: [GMCnet] Onan Not Starting... [message #166607 is a reply to message #166605] Tue, 17 April 2012 10:40 Go to previous messageGo to previous message
Dennis S is currently offline  Dennis S   United States
Messages: 3046
Registered: November 2005
Karma:
Senior Member
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?
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Dennis S
73 Painted Desert 230
Memphis TN Metro

[Updated on: Tue, 17 April 2012 11:42]

Report message to a moderator

[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: [GMCnet] GMC furnace
Next Topic: Trying to figure out things!
Goto Forum:
  


Current Time: Thu Jul 04 21:12:24 CDT 2024

Total time taken to generate the page: 0.00567 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software