But that's at
the pump... right? That means you need to start backtracking to find the point where power still exists on the circuit. If it was OK just before the wiring was cut, it's almost certain that the problem will be in the same area. Pull the brake lamp out or access the wiring from inside the van (if not finished) to check the ASD feed. If it's good to there, your problem is somewhere below that point and will be very near the wiring problems you described.
If no power is seen at the ASD wire (either side of the connector) at the brake lamp area, we need to look forward on the van, perhaps all the way to the bulkhead connector, where power from underhood is transferred to the inside of the van. It's a matter of isolating and corralling the problem into something you can trace one way or the other. The brake lamp area is a good starting point.
It might be handy to power the ASD continuously for this task. Locate the blue/ yellow wire on the relay and insert a small screwdriver or paper clip attached to a jumper wire into the connector end.
Ground the jumper wire and turn the key on. This should energize the relay just as if the engine was being cranked... saving the battery
and making it a one-person job.
Be sure that there are NO fuel lines disconnected to prevent uncontrolled fuel leakage if the pump was to suddenly start working again. Otherwise, this should be perfectly safe.