Sorry, this is a bit long, but I wanted to put all the details out there from the start.
Here's the setup:
2001 F-250 4x4, 7.3PSD, ZF 6-Speed, DP Tuner switch chip, 4" turbo-back, South Bend Clutch and solid FW, Gear Venders O/D, and 3.73 gears.
I've had this truck stored in my shop for about 8 years. Dry, warm area. Started and warmed up once a year or so.
It has only 84,000 miles and was my Dad's truck, and means a lot to me.
Anyway, I needed to tow my race trailer to Florida and back.
I put tags on it, Changed the oil with Rotella 5w40 Synthetic, and took it by the dealer to address the CPS and cruise control switch recalls. They replaced the CPS and added the fusible link to the CC switch.
Filled it up and left for FL with the empty trailer.
Drove approx 750 miles with the DP set to the 60HP tow mode, everything running fine and EGT at 800 deg at 75mph cruise (1,700 rpm).
The last hour or so, I did notice EGT's creeping up to around 900deg, I thought the warm FL air may be the cause.
Suddenly, it lost power and started missing badly. I cancelled the cruise and whenever I gave it fuel, it started missing, with low power, and higher EGT's. Boost was lower as well. I had filled up about 100 to 150 miles before this started. I nursed it along to a service station, thinking the fuel filter may be clogged.
They didn't have the filter, so I drained a few ounces from the bowl, which looked clean and free of water.
Primed and refired, and it ran normally the remaining 40 miles.
Next morning, again ran fine going to get a new filter. Changed the filter out, and the old one was pretty dark. Fuel bowl was clean.
Reprimed and started up, and went to load up the trailer.
Again, it ran fine for around 700 miles coming home, this time with around 8,000 or 9,000 lbs in tow.
Did the same thing about 100 miles from home. Tried draining the filter several times, but only cleared it up for a few miles at best.
It did come and go, sometimes running fine for 10 miles or so, then missing and slow for a while.
At first it seemed it would clear up for a while after descending a hill, but once it cleared up while trying to maintain speed climbing a slight hill as well.
Naturally, when it would start missing I backed off, downshifted and tried to keep engine load as low as possible, which reduced the shaking.
Anyway, after draining the bowl the final time, when I turned the key on to prime, the fuel pump seemed a bit louder than I remember it being.
At no time did I get a CEL or any other indicators on the dash. I have the Torque App and a Bluetooth Dongle that I took along out of curiosity, and the few parameters I had setup to monitor all looked normal as well.
My thinking is it needs a new fuel pump at a minimum. Other educated opinions are welcome.
I know this truck has a frame mounted fuel pump, but is there another pump in the tank?
Is there a strainer in the tank that I can change as well.
I plan to drop the tank either way, just to make sure there's no algae or other crud in there from storage or from a dirty load of fuel, and to modify the vent so it doesn't take 10 minutes to fill it up.
Also, unfortunately this is likely the first ULSD and biodiesel blended crap this truck has drank as well. I wonder if that could've caused the problem? That crap seems unavoidable nowadays.
Any advice is appreciated, unless you intend to jump me about not driving the truck more.
Thanks in advance,