Military-Vehicles: Re: [MV] M38 carb question

Re: [MV] M38 carb question

Rick Green (rgreen@mail.datasys.net)
Sat, 05 Jul 1997 23:35:31 -0400

SBJohnston@aol.com wrote:
>
> Hi gang...
>
> Perhaps some kind soul can help me out...
>
> While troubleshooting a problem of intermittant loss of power (went away when
> cleaned out the fuel intake screen and shot carb cleaner in) I started trying
> to figure out the purpose of the threaded port on the upper drivers side of
> the carburetor (above the fuel inlet port) on my M38's engine. When I bought
> the jeep, nothing was connected to this port, but the disconnected tubing and
> connector from an unlabeled black-knobbed pump on the dash was nearby.
>
> When the engine is running you can feel a slight vacuum if you plug the port
> with your finger. The engine lugs down a bit a few seconds after plugging
> the hole, like the mixture has changed, so I assume that air is being drawn
> into this opening. I thought about plugging it with a threaded flare plug,
> and readjusting the carb, but I guess I'd like to understand what is for
> before taking any action.
>
> Drawings in the Tech Manaual show an elbow and what is termed a "vent line"
> attached to this port. It is not easy to see where this vent line goes, but
> it looks like it goes to a fitting on the rigid portion of the fresh air duct
> leading from the air cleaner to the top of the carb. A similar fitting does
> exist on the air duct, but it is plugged right now. But what would be the
> purpose of a secondary air intake on the the carb, coming from the same place
> the main air comes from?
>
> This jeep shows signs of once having the fording option installed (such as
> the black-knobbed pump on the dash)
> Perhaps there was some interconnection between this system and the mysterious
> (to me) carburetor port.
>
> Any ideas? Thanks!
>
> Steve Johnston
>
> sbjohnston@aol.com
>
> ----------------------------------------------------
> "Jeepobsession" -- a new fragrance by Cavin Willys.
> Smells like 90-weight gear oil leaking onto a garage floor.
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>
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The black knobed pump on the dash is for priming the engine and carb,
I have several of them in stock and also the complete pump and hose kit
for all sorts of vehicles. The pumps are 30 and the complete kit is 40
dollars. I have several of both types NOS.
jason
912-794-3566

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