I think it is pins 7&8 in the fuel pump relay socket. The pins on the bottom of the relay are different. I would suggest you disconnect the negative battery terminal, install the jumper, have the injector ready to observe, push down air plate, touch battery cable to battery for a few seconds and see what happens. For this test, the ignition does not need to be on. Don't leave the jumper in and battery connected for a long time until we determine what the problem is. An internal leak could fill the engine with fuel.

Paul

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84 500 SEL (307,xxx miles)