It sounds more like a fuel pump problem than anything else. You can try
bypassing the fuel pump with a gravity feed from a container higher than
the carberator, hooked direct to the carb.
This will indicate weather the fuel pump is the culprit. If the problem
still persists, next step would to be rebuild the carberator. The only
other thing you might want to check is the valve settings. On my M38A1,
one of the exhaust valves was adjusted too tight. When I first started it,
it seemed fine, but as soon as I needed any kind of power, there was none
(at least it kept running, which leads me to think you have problems with
one of the above). I found this valve adjustment problem by checking
compression levels, then upon checking closer found the valve to be
adjusted too tight. Hope this helps,
Cliff Dahl
wrcc@rapidcity.com
M2A1
M38A1
M211 (2)
M105
----------
> From: SBJohnston@aol.com
> To: Mil-Veh@skylee.com
> Subject: [MV] M38 loses power, stalls
> Date: Wednesday, July 30, 1997 7:36 PM
>
>
> Hi gang:
>
> I have a problem that is driving me nuts! Or put another way, driving
my
> M38 is driving me nuts. About every other time I take the old girl out
on
> the road, she lets me down.
>
> After about 10 minutes of normal suburban driving the engine begins to
lose
> power, sputtering down to almost nothing. The throttle action seems
"mushy",
> not responsive. With a few pumps I can rev it back to life a few times,
but
> finally it stalls entirely. Then I can crank and restart the engine a
few
> times, make a little more progress down the road, then the cycle repeats.
> Finally, the engine dies and refuses to restart till I leave it sit five
> minutes or so. Then I can restart and nurse the sputtering engine home.
>
> The symptoms seemed to point to fuel starvation -- the mushy gas pedal
action
> particularly. I measured the output of the fuel pump at about 3 lbs --
that
> seems low. Opinions?
>
> In the shop I can sometimes reproduce the rough idle. Once while it was
> sputtering like that I quickly connected a can of gas on the floor
directly
> to the input of the fuel pump. It sputtered just the same. Hmmm. That
> rules out a plugged fuel filter or lines ... perhaps something blocking
the
> carb? Last time I thought I found the trouble when I cleaned the carb
intake
> screen, but not so.
>
> Someone thought it might be vapor lock -- but the engine isn't really
warmed
> up when it strikes.
>
> I am getting tired of just driving around the block -- I've got to get
this
> problem fixed so I can enjoy the jeep and not be afraid to drive too far
from
> home <<sniff>>. Any ideas?
>
> Steve Johnston
>
> sbjohnston@aol.com
>
>
>
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