Based on the above diagram with what is visible, I would cut the ecm wire or red/yel wire, this will have the least amount of current of any of the lines and will cut off the ecu along with the fuel pump/injectors/ign, ect. If I could see the rest of the wiring, that may change but I doubt it.
Cutting the FP only will allow fuel to trickle through the injectors under low manifold pressure. Some cars will even run without the FP being on if they are of the centrifugal type.
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