On the A9l series it is pin 22. '94 - '95 is also pin 22. I'll go out on a limb and say it is probably the same on '86. Some things they haven't changed over the years.
Also, when the key is on there should be +12V to the shutting coil. So there should be two pins in the relay plug with power. See if you can jumper the grounded side(ecu side) of the shut coil and see if the pump runs.
On the car that had the pump circuit fail on the ecu, we wired a manual switch (with the owners permission).
Mike
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