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You're finding terms that GM doesn't generally use. I believe this refers to the "hot fuel handling module" used on some trucks to circulate fuel for up to 20 seconds. Old GM literature said the module could circulate fuel after the key was shut off but folks on the net seem to believe it simply extends the pump prime time. Either way it's not found on most trucks.
You are correct. It is the hot fuel handling module. I have been combing various wiring diagrams, because of my various parts. Engine from and wiring harness from an 89 k2500, 92 g20 wiring harness. I think I was making it way to hard on myself. GM did use the term Fuel Cycle Module but I'd have to go back and look through all my diagrams.