Ford 7710, Ford 550, Ford 1910, Ford 4430, KD Forklift, Ford LGT17H, New Holland L255 Skidsteer
You may want to see if it is a bad fuel lift assist pump. I am not too familiar with that pump, but it is cheaper to look there and perhaps bypass with an electric pump to eliminate if you can't see anything obvious with the pump itself.
I did not locate a fuel transfer pump in TC45DA parts catalog. My guess is 1 or more injection pump plungers seals are at allowing diesel to enter engine crankcase.