What's the story on the fuel tank (or tanks again)? Rusty watery crap in the filter is usually a storage issue......... tank.
It's the 1st place I'd start.
Heath
It's the 1st place I'd start.
Heath
Mmm. Diesels Don't Like Fuel That Looks Like That
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Which filter is dry, the one up on the tower behind the alternator, or the prefilter down on the frame? Remind me again what fuel pump you're running, factory mechanical or aftermarket electric? The mech pump can move some thick soup, so unless it's dead (indicate by full prefilter before it but empty tower filter after it) then you got suction issues. What did fuel pickup look like inside the tank, is its some sock that can clog up easy or is it just a wide open piece of 3/8" tubing?
On a side note, truck being diesel means you can have fuel tanks on outside of frame rail - and with a flat bed you got space for them easy, I'd be very tempted to ditch the contaminated factory tank and run something made for medium-duty trucks.
Mmm. Diesels Don't Like Fuel That Looks Like That
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Thought you said they don't make new tanks for these trucks, so what did you use instead, a small ****** tank? Either way good to hear the problem has been solved. When you got some time to kill how about splitting the old tank to see exactly *** was going on inside it?