From: Sonny Heath (sonny@defuniak.com)
Date: Sun Oct 03 2004 - 11:16:29 PDT
Dick,
Jim has a good idea, I totally missed the part in your post where you said
this all started when you replaced the fuel cap.
Sonny
----- Original Message -----
From: Jim Gilmore <jgilmore@ptd.net>
To: Military Vehicles Mailing List <mil-veh@mil-veh.org>
Sent: Sunday, October 03, 2004 11:41 AM
Subject: Re: [MV] MUTT quits running
> Dick wrote:
> > My M151A1 starts fine. It runs for about 20 minutes, then quits. I let
it sit for about 10 minutes, then re-start it with no problem. It runs for
about 3 minutes, quits again. I can repeat this many times. If I let it sit
over night, the same pattern.
>
>
> There are two types of fuel tank caps used in the M-series vehicles.
Vented and non-vented. Both will interchange and look alike. In addition,
some caps have a valve inside them that can be turned to make it non-vented
or vented.
>
> If you are using a non-vented cap or the valve is closed eventually the
vacuum in the tank will be greater than the fuel pumps and you will actually
run out of fuel in the carb. After some minutes, the vacuum in the tank will
subside and your pump will be able to deliver enough fuel to the carb.
>
> When your motor quits, open the gas cap. if you hear air going into
the tank, you have the wrong cap or the valve is closed.
>
> As another test, try driving the vehicle with the gas cap loose and see
if this corrects the problem. If so, replace the cap with the correct one.
>
> Also note: There are two different fuel systems for the M-151-A2.
>
> "Clean Air" systems and pre-"Clean Air" systems. The components, Carb,
fuel tank, fuel tank cap are specific to each system. Use of components from
one on the other will cause problems in driveability. The fuel tank cap from
the "Clean Air" system should not be used with Pre-"Clean Air" fuel tank.
>
>
> Jim Gilmore
>
>
>
>
>
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