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

Default

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

like so:
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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.
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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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