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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially and if have not been tried; inspect the battery & ground lines and/or check/clean the battery cables + terminals, connectors and wiring as a preliminary consideration. Have the battery externally charged and then LOAD TESTed (even if new and just for the purpose of eliminating it as a suspect).
Proposed secondary tries (if have not been done):
To my recollection, this model has a tip-over sensor that if engaged would halt the fuel pump operation through the fuel pump relay. If the pump is not working/priming, has this been checked together with the relay and pump itself? ...IGN+12V present?
Appreciate the post back and an update tomorrow or when able.