From: Mike Howell (doctormv@frontiernet.net)
Date: Mon Mar 20 2006 - 19:59:59 PST
The bottom one goes to the "water in fuel" solenoid (which I assume just
Your rough running problem sounds like what someone on the list
turns on the light in the dash), the middle one goes to the fuel
pressure switch which is only used in the diagnostic circuit (the big
plug under the dash) and the top one is labeled "fuel heater" (I have no
idea how it works). I think civi filters bases are the same less the
fuel pressure switch. I know they take the same filter.
described when their pump seals were breaking down from modern fuel
additives. Do you know if your fuel has them? Original pumps will start
having little black flakes stopping up the works as the seals start to
break down. This will lead to total failure eventually or so I am
told. Rebuilt pumps use additive resistant seals. I tried to find the
original post but couldn't..
Mike
Tishomingo,MS
Jim Cooney wrote:
>Hi List,
>
>I've a few questions in relation to my M1008 CUCV. (any non MV content types
>on the list please hit DELETE now!;-}).
>
>I've had a few instances where my truck has been running roughly at low RPM
>and then seems to clear itself and want to take off like poop off a
>scoop.The problem seems to be an intermittent fuel starvation problem. On
>St. Patrick's Day I was in a local parade with my truck. I was driving very
>slowly at a typical parade pace. When I would stop during the parade and
>then take off after maybe a couple of minutes, my truck would hesitate and
>be reluctant to accelerate but would eventually clear itself and run OK. I
>have a recently fitted lift pump in my truck however, the fuel filter
>mounting assembly and fuel filter is off of an Isuzu SUV of some
>description. This was fitted to my truck by it's previous owner. I have
>changed the fuel filter regularly on my truck.
>
>I intend putting back a second hand stock CUCV filter housing and new stock
>filter on to my truck in the hope that this may help my truck's apparent
>fuel problems. What I can't figure out is that the stock unit has three
>different connectors coming out of it - one is a three pin block connector
>with a yellow/black, red/black and a black wire leading to a sensor which
>screws to the filter mounting unit - one is a square two pin connector with
>a black wire and a brown wire coming out of it leading to a solid state unit
>which is set in the top of the filter unit - the other is a two pin
>connector which has a brown wire and a grey wire coming out of it which
>leads to a sensor of some type which is mounted behind the filter on the
>mounting plate. How come my truck runs without any of these wires/connectors
>which aren't on the Isuzu unit? What is the function of all the wiring that
>is on the stock unit? Where do they connect to? By replacing the filter unit
>with a stock one would this help solve my intermittent fuel supply problem?
>
>As we don't have very many US vehicles here in Ireland either civilian or ex
>Military I have no other vehicles to check for reference therefore I'm
>hoping that someone on the list will be be able to help me out.
>
>Thanx in advance,
>
>Jim.....in Ireland.
>M1008 CUCV and S-250 Shelter.
>
>
>PS......where does the much maligned "fuel pressure sensor switch" fit in
>with the scheme of things?
>
>
>
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