[adynes]

I would just relocate it, even if only temporary. Low pressure fuel lines are cheap and easy enough to rerun, as well as extending the wiring.

Another thing to consider... How closely connected are the 12v/grounds for the pump, and for the crank sensor? Ideally, very far separated from each other. If not, maybe some sort of filtering can be added.

On my setup, I have the battery in the trunk, supplying power directly (through relays) to the in-tank fuel pumps. The computer (MS1-Extra, under-dash) gets it's power through a long length of it's own dedicated wire, and grounds to a cylinder head