More Ford 4000 fueling issues

Bama Boy

New User
No idea where to go next with this thing.It has
the 3 cylinder diesel with the CAV injector pump.

I replaced the fuel filter on it, re-primed and
got it to crank. Running great. So I take off to
start cutting a field and in the middle of the 3rd
pass it drops power and dies about a minute later.
I re-fire it and it will only run for about 45
seconds to a minute before dying again. I get
tired on messing with it for the day and tow it
back to the shed. I wasn"t able to get back to it
for about a month.
I assumed there was some type of trash blocking
the flow so I started with the small line filter
screen on the side of the pump, it was full of
crude. Next I remove and check the fuel filter
that I had just replaced a month earlier with only
about 30 minutes of run time on it. It was about
75% full of WATER. So it got replaced again.
Drained the fuel tank and it had about a gallon of
WATER in it. Cleaned the screen filter in bottom
of tank, flushed tank, and blew dry with an air
compressor. Also blew out all the lines going from
pump to tank.

Refill the tank with clean diesel and go through
the priming process.So this is where the questions
come in since I don"t really know how it is
IDEALLY supposed to be as far as fuel pressure
goes.

When you loosen the primer screw on the pump, is
the fuel supposed to be squirting out a strong
stream or just a constant weak flow?

When you take the fuel line off the injector,
should the fuel be a strong squirt or steady drip?

What will water do to a pump if it gets into the
fuel system?

We got the system primed with all the air out, but
couldn"t get it to fire. So after several attempts
we decided to pull it around for a bit. It finally
fired! However at FULL THROTTLE it wouldn"t rev
any higher than 1200 rpm. We let it set there and
idle for roughly 10 minutes before it died. We
pulled it off again just to park it back under the
shed. Same result. Ran a few minutes at a 1200 rpm
max and then died again.

We are thinking the pump maybe bad. Pump was
supposedly just rebuilt before we bought the
tractor a year ago. Open to any ideas at this
point.

thanks in advance
 
It doesn"t take long to stick a metering valve in a CAV pump, especially if it had that much water in it. If you feel comfortable, lift the top cover, I"ll bet its contaminated[rusted].. with a stuck metering valve..
 

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