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Home » Public Forums » GMCnet » [GMCnet] I give up. (Onan)
Re: [GMCnet] I give up. (Onan) [message #187884 is a reply to message #187879] Sun, 21 October 2012 16:54 Go to previous messageGo to previous message
jimk is currently offline  jimk   United States
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma:
Senior Member
Should one have ignition problem, I found out from a friend that the points
need to be rather clean to work properly.
I was spending lot of my personal time on a unit , when my friend stopped
over and and told me straight out how stupid of a J-p I was by trying to
save a customer cost of points.
I put in a new set and it did the trick.
I think he was correct to call me a stupid J-p.
The Onan has a very weak ignition system, so it demands the best.

On Sun, Oct 21, 2012 at 2:07 PM, Matt Colie <matt7323tze@gmail.com> wrote:

>
>
> Robin Hood wrote on Sun, 21 October 2012 15:48
> > Thanks Jim. I've been messing with this thing for WEEKS now, off and on.
> Jumping 9 and 5 causes a solenoid just upstream of the fuel pump to click,
> and that's it. Pump does nothing.
> >
> > I've tried everything I can think of and read all I could, but it's
> > just beyond me. :(
> > --
> > Robin Hood
>
> Robin,
>
> You are obviously literate and have an IQ well over 80 - Therefore, you
> are very probably more capable than anybody you will be paying to work on
> this. (One of my standard lines..)
>
> Now, you may just have done your diagnosis in the line above.
> The fuel system has three(3) parts.. the fuel pump (big cylindrical thing
> with fittings in sides above and below and electrical connection. The
> solenoid valve is much smaller and typically between the pump and the
> carburetor. It has its fittings in the ends.
>
> The solenoid valve should click once and once only when you put the jumper
> in place.
> The pump will click continuously - if it is working.
> You may not even hear the solenoid. It is not very pronounced. But the
> pump is easy to hear.
>
> If the pump is not cycling, it could easily be the internal contacts.
> They are easy to clean and I am sure someone has written this job up for
> the GMC people somewhere.
>
> If it is cycling, loosen the fitting at the carburetor (real PITA to get
> at) and see if fuel is leaking out with the jumper on.
> - If Not, your problem is in the fuel system nearby.
> - If It is, the problem is now the ignition or the carburetor.
>
> Test the ignition.
> Pull one spark plug cap, put a screw driver into the cap and arrange it so
> it is near metal like 1/8" or so. Put the jumper back on and hit the start
> button.
> Did you see a spark?
> - If not, clean the points and try again.
> - If yes, the problem is in the carburetor.
>
> That may just need cleaning.
>
> Let us know before you spend money.
>
> If given minimum care, these things are anvil reliable and so easy to take
> good care of that it is awesome (in the true sense).
>
> Matt
> --
> Matt & Mary Colie
> '73 Glacier 23 Chaumière (say show-me-air) Just about as stock as you will
> find
> SE Michigan - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
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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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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
 
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