You don't need to disconnect the wires to the ECU if you don't use a reverse pulse charger. A remote radio jack and charge
at 2 amp. is ok.

As far as no gas can, is it a safety thing? If so the bleed down
option still leaves fuel line pressure in the can.

You can use disconnects like air lines that shut off the line when
you break it and no onbord gas can.

Darryl Usher www.acsip.com/~dgu