From: Bobby Joe Pendleton (bjpendleton@charter.net)
Date: Tue Dec 07 2004 - 17:42:10 PST
did you by chance check the float? They tend to crack and fill with gas
causing the engine to flood.. Also fuel pressure should be no more than 2
1/2- 3 PSI, any more and the engine will flood. I got my rebuilt carb and
fuel pump from Memphis Equipment.
BjP
"Maneo Qualis Manebam"
----- Original Message -----
From: "Santoken" <santoken@bright.net>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Tuesday, 07 December, 2004 20:33
Subject: Re: [MV] G749 GMC Carb rebuild questions
> Well, after looking closely, and spending a few more hours with this
> carb, and looking into responses from the earlier post...I'm still
stumped.
>
> So, this leads deeper, does anyone know what the fuel pressure should be
> on a G749? You see, somehow or another I lost the original fuel pump so
> I obtained an aftermarket Carter 24v fuel pump. It seemed to run fine
> earlier, but I'm trying all options. The fuel pump that I installed is
> rated for 5.5-10 psi...which from past experience should be well within
> the required specs...but I'm not sure about this application and perhaps
> the fuel pump is malfunctioning.
>
> Or better yet, does anyone have the original fuel pump, and fuel pump
> module box they'd be willing to part with?
>
> Thanks!
>
> Santoken wrote:
>
> > List,
> >
> > AT the beginning of summer, I had my M215 running sweet. When you tried
> > to start it, you didn't even hear the starter motor run because the
> > engine seems to start running first. It started and ran that nicely.
> >
> > After sitting all summer, I started it to move it and it barely started
> > and ran horribly. It was running entirely too rich. After I got it
> > moved, I tore into the carb. Yeah, it was running WAY too rich. Seemed
> > that the bowl was leaking fuel down into the carb just sitting there,
> > not doing anything. I decide to do a rebuild.
> >
> > After paying the horrible money for a sub-standard kit, it still does
> > the same thing. I have had that carb on and off so many times I can't
> > count.
> >
> > Is there anyone out there familiar with that Holley that could give me a
> > few pointers? This is the most bastard carb I've ever seen and since
> > the carb kit didn't come with any literature, I could really use some
> > outside knowledge on it.
> >
> > After running the idle mixture screws bottom, and dropping the float all
> > the way down...it runs OK...just ok. When I back the screws out, it
> > starts faltering. Adjusting the float does the same. When the float is
> > set to proper height, and the air-horn off, I can see fuel dribble into
> > the carb...I can't really see where it's coming from, tho.
> >
> > The idle circuit appears to be fine since the idle mixtures screws seem
> > to effect its idle quality. The bowl is not cracked and the power valve
> > is functioning properly. The kit that I got came with new metering
> > orifice tubes but they look nothing like the old ones, have these been
> > redesigned to repair some known problem? The old tubes had the base
> > crushed shut, the new ones did not...and the orifice on the new ones is
> > MUCH smaller...surely effecting the air bleed.
> >
> > Has anyone else ran across this same problem?
> >
> > Thanks,
> >
> > Kent
> >
> >
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>
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