Yes .. that is really the way to emty the tank but cannot confirm these are the wires that feed the fuel pump . CHeck color: 4 wires? black and black are grounds and gray is +12V to pump, purple is level sender, ...Polarity must be respected as the pump would rotate in opposite direction if reverse connection is used:
www.avigex.ca/xport/fuelcontrol_iac.jpg
you can also access that ...
(
this method somewhat complicated, left here just for the record....from plug C200 at base of LH A pillar, left of parking brake, cavity B3
www.avigex.ca/xport/C200pinout.jpg
www.avigex.ca/xport/C200location.jpg ..based on the '93 diagram, which is most probably similar).
or directly from the relay socket as seen on diagram. There is even a red wire that hangs around seemingly doing nothing and this is the "primer" wire for the fuel pump: relay must be in socket and applying 12V to this red wire fires the pump. I think this is seen here:
www.avigex.ca/xport/Dsc06465.jpg
..and as soon you have the slightest sign that pump is taking air, stop immediately. There have been numerous reports that pump that went bone dry did not survive the event....(whatever the cause)..
ANd YES, pictures and reports of the engine swap are highly wanted. Did you keep the original electronics? THis is a first here and everyone will enjoy hearing more. If you do not want the hassle to host the photos, just send them: I will host them for you if you want so everyone can access them. (will e-mail you the links so you post them yourself).