Fpcm (Fuel Pump Control Module) Removal R32 Gtst

[Skylsh32]

Hey guys,

I'm going thorugh the whole "removing wires that are needed" phase on my r32 gtst skyline and would just like to confirm more or less is that the FPCM unit and all it's wires (Green/white, White, Black, Black/Yellow) can be removed from the system, to me it makes sense that it can because a lot of guys out there are already bypassing it with the direct feed mod therefore making the FPCM and resistor in the engine bay useless.

I'll be re wiring the fuel pump setup tidily, so all the wires I really need from the factory setup consisting of fuel pump, fuel pump relay and FPCM is the following: (please note colour wires are for the R32 gtst.)

Black and Blue wire which comes off the fuel pump relay (Ignition)

Black and pink wire again off fuel pump relay (pin 18 off the ECU fuel pump trigger wire)

Yellow Blue at the fuel pump lid otherwise black/red on the loom side (fuel light wire)

Yellow at the fuel pump lid otherwise green/blue on the loom side (fuel level sensor)

I hope I am right, if anyone can confirm my workings that'd be awesome :-) have a great day and thanks in advance.

Edited May 21, 2014 by Skylsh32

[scotty nm35]

They are not 'bypassing' it, the fuel pump control module is energising the new power relay. If you bypass the fpcm your pump will never turn off, which is very dangerous in an accident.

[jiffo]

FPCM has nothing to do with killing the pump in the event of an accident, the ECU takes care of that via Pin 18.

ECU triggers the fuel pump relay, giving the pump positive feed.

FPCM alters the voltage of the negative feed to the pump.

[Skylsh32]

Okay so based on that I would assume it is fine to go ahead and remove the fpcm?. I would be getting 14.4v full time rather than it varying due to engine state, idling etc.

[Ben C34]

Why actually remove it though?

The effort for gain seems not worthwhile.

[scotty nm35]

Sorry, just going by the later VQ fpcm which actually controls the pump as stated in its name. I forget the ecu in the 32/33 is the only ecu in the car. Mine has 8.

Bypassing the resistor to remove weight seems pointless. It weighs less than 1 sardine.

[Skylsh32]

I ended up still bypassing the fpcm but keeping all the wiring there just taped up. Thanks guys!!

[89CAL]

This is how it works in R33: