164L help

[sm <scouple@xxxxxxxxxxxxx>]

    I am having difficulties with my 91 164L

It was running fine in the moring and and lunch took longer than usaul
to start and then would not start...
Not getting fuel.  I checked for power and none to the pump.   I bought
manuals from Centerline and traced the wires in this way.   At the fuel
pump relay it is getting power, however the relay is not working.   I
tried a new relay and still nothing.   The grey/white wire from 86 on
the relay goes to the Motronic Control Unit according to the schematic.
Unfortunately, the schematic does not show where the Motronic unit is
located.

1)  Can anyone tell me where the Motronic Unit is located?

2) The manual says to check for voltage at #20 on the control unit.  If
voltage then the unit is bad as it should be grounding to complete the
circuit.
     is there a test I can perform to see if it is the unit once I find
it?

3) If it happens to be the Motronic C Unit:   Would a performance chip
remedy it?

Thanks in advance to anyone who can help.   My local mechanic is not
very helpful(I live in Venice, California).   I also own an 81 GTV6 and
have done everything on it except electronics.   They are even more
complicated on the 164 .  So this will be a great learning experience.
Too bad I have to learn it the hard way!

Happy driving

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