No, you can not run them while they are diluting the oil. The diesel fuel will thin the oil and it won't lubricate the pump properly.
I'm pretty sure all you need to do is get the lift pump rebuilt for that problem. When I did mine it cost $100 said and done. That was 7 years ago so it is probably twice that now.
Call the guy in Iowa and ask him prices on rebuilding the lift pump and the big pump. I wouldn't be too excited to overpay for that SMD with a known problem like that. It would certainly be a barter point.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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