Need a wiring diagram. If the HFM controller dies with the OVP (I can't remember on an HFM car), then it is likely the fuel pump relay won't turn the pump on. I'd jump the fuel pump relay and see if the pump runs. Then I would see if it starts.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician