Hey Keith! I just had the pump worked over at a diesel shop on a 255 with the 203D. There is a skinny O ring at the rear of the punp, have to tear it apart to get to it, might as well replace them all while you are there. There is a guy here, "Dieseltech" that has some good info. I blame low sulfur diesel but it was 36 years old at the time so it was going to leak eventually. I replaced some washers first but the problem continued. Good luck with it!
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