One, fuel filter in the tank is plugged. Two: electric fuel pump is going bad. Three: fuel filter on top of motor is clogged. Four: HPfuel pump is going south. I had the same problem with my 99 7.3 at 265K miles, it was both the first two things listed causing the problem. It will run bad when the oil gets dirty and the oil filter starts to get plugged too, this reduces the oil pressure to the HP fuel pump causing a fuel pressure loss at the injectors.
Sounds just like a CPS. But curious...how long "down the road" before it quits? In other words, I'm curious if it's starting and running OK while cold, and once it starts to get warm it quits (say, 3-5 minutes after starting).
I have repaced the CPS, there are no codes when it dies. There is really no given amount of drive time. It will happen randomly while driving as short as five miles down the road or I have driven a forty mile round trip and it did not die. I have left it idle for hours and it will not die. This has been going on for a year, so I do not drive it much anymore. It is time to get it back on the road. Dealer is lost and wants to start changing out parts. Seems like most responses other than CPS which was replaced a few weeks back are fuel filter related.
When you drive it, at what point does it die ? Mine ran fine until you put your foot into it and upped the fuel demand. That's when it ran short of fuel, creating an air bubble in the lines, that leads to the engine killing. Just like a human, it only takes a small air bubble in the veins (fuel lines) of a diesel to kill the engine. Starting it and letting it idle in the driveway, it would run all day. But the minute you started down the road and rev'd it up past 2000-2500, it would quit. We dropped the fuel tank and the stock filter assembly in the tank was falling apart. I completely removed this, replacing it with a short piece of fuel line and a brass "T" at the bottom, about a 1/2" off the tank bottom. Also wrapped that with plastic window screen to keep any larger trash out. I then installed an inline fuel filter/water separator (spin on)mounted to the frame just before the electric fuel pump. A few weeks later the electric pump went south (on a bumpy road) and I replaced it. No problems since.
No bucking engine just dies and will not start for an hour or two. The problem does not seem to happen in cold weather. I do not believe it is RPM related (2000 - 2500 rpm) although it maybe accelerator related.
Sounds close to my problem as well. I have changed the fuel pickup and filter, but still dies at about 30 miles of highway driving, but mine bucks slightly at idle and low RPM. It acts as if it runs out of fuel... White smoke and coughing, power dropping out ect. After cooling down 30 to 45 minutes, I can go 30-ish miles again.
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