unless it's a misprint or I'm misunderstanding terms used here,
the way I see it, when engine is running, the ECU "supplies" negative
to fuel pump relay 85
This is what turns on that relay.
ECU relay 87 sends positive to fuel pump 86 via a main positive
connection in harness. (G1 or 26). Indeed when ECU relay is energized,
it sends positive to fuel pump 86.
Neil.

On 6/1/16, Robert Keezer <warmerwagen@yahoo.com> wrote:
> Hi Ed,
>  There's a diode in the #53, where it's used as the  Engine Computer relay.
>
> When terminal 86 of the relay is energized (key on ), it activates the
> computer and sends power to the 86 terminal of the fuel pump relay.The diode
> allows current to pass in one direction, as the ignition coil also shares
> the computer #86 terminal.
> This from page 97.124 of the Bentley
>
> Robert1982 Westfalia
>

--
Neil n

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