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Old 11-17-2012, 07:13 PM   #46
Scooby Guru
Member#: 4414
Join Date: Feb 2001
Location: Dublin, CA
2002 WRX Sedan
Midnight Black


Has anyone done this so that the relay is before the fuel pump controller?

like so:
Cut the ACC 12v wire that goes into the fuel pump controller

30 - 10 AWG -- fused @ battery.
87 - to where the 12v was going into the fuel pump controller connector
86 - Use that factory 12v wire that power the fuel pump controller as the relay trigger wire
85 - 10 AWG ground wire

- Run 2 additional 10 AWG wire for pos and ground from the output of the fuel pump controller back to the fuel pump instead of the skinny factory wires.

Now you should have lower voltage drop but maintain the fuel pump controller 33/66/100 switching. Seems like this may be good for cases like xluben, where they just need a small bit of extra headroom on a DW300 / aero340 size pump, but would prefer to keep the duty cycle changes from the stock controller.
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