A couple of things to test would be, the fuel filter and also considering the age of these vehicles, you might want to check the resistance in the wiring to the fuel pump. I havent worked with supra's a ton but I have worked with a bunch of toyota's, and this has been the case 2 times. Just an idea. Also, check the main relay, I dont know for sure or not but in earlier cars the fuel pump relay is built in with the main relay, and when these relays get old the wiring in the board likes to get a hairline crack in it, so it also could be the relay, somone correct me if im wrong though.
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