I wonder if the diesel is old or if he has gotten some wet or dirty diesel? Open the fuel tank drains, hold a plastic cup under it and see what comes out. Rust, water and debris are not good in the tank. I have cleaned by tanks once. I drained as much junk as I could get from the tank drains, then had a marine company come to my site (I was in Newport Beach, CA at the time) and pump my fuel through a multistage filtering system. The fuel was reasonably fresh but I had gotten a tank of diesel that must have been from the bottom of their tank based on the amount of debris it put into my system. I was having to change fuel filters every few hundred miles.
That was the only time I have had a problem. Last time I opened the drain valves on the fuel tanks, everything looked good.
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