[Phantom]

I would rather use power service and up the strength, or run diesel purge directly to the enjectors to clean them.

Bio-D is great and should not kill the pump if the tank is very dirty it could loosen gunk and clog the pump killing it assuming the pump is be for the fuel filter. If after the filter gust get a few cheap ones or an inline and change them a few times. Also from what I remenber Bio-d will wet dried orings/seals and switching back to ULSD can reshrink them causing leaks.