"the ECU "supplies" negative
to fuel pump relay 85"That's correct, Neil.
The ECU controls the negative ground side of the fuel pump relay at terminal #85.However, the only load that the #87 ECU relay supplies is to the ECU, to the power steering pressure switch, and the Idle Stabilizer Control Unit.
The fuel pump relay #86 and the ECU relay #86 is a bridged connection, a wire connects them so that when the key is turned on, the ECU and the fuel pump are both switched on, though the ecu then only activates the fuel pump momentarily to pressurize the fuel rails.86 is a key-on power connection, and 87 is a load connection only .87 is not used to send power to 86.
Robert1982 Westfalia

 
      From: Neil N <musomuso@GMAIL.COM>
 To: vanagon@GERRY.VANAGON.COM 
 Sent: Wednesday, June 1, 2016 11:20 AM
 Subject: Re: VW relay #53, 141 951 253B
   
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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