s14 fuel pump wiring, help - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

420sx · 12-21-2008, 02:45 PM

ok i got everything hooked up to start the ls1, but i get no power to the Fuel pump. nothing, blank. i still need to flash the ecu but the pump should at least prime before ecu shuts off the relay

there are several wires going from the fuel pump. im using an aftermarket relay,
now my wire going to the fuel pump needs to be hooked up to 12v POWER wire. i hooked it up to black/red wire but pump will not come on.

from reading up some more, i understand that nissan fuel pump is activated by the ground, and GM is activated by hot wire.

QUESTION. what are the wire colors/ functions.

the fucking FSM has no info on that and im can't find anything on this anywhere, all i find is relay and sr wiring which is useless to me.

CLIFF NOTES: which one is power wire for the fuel pump? is it BLACK/YELLOW? what are the colors/functions of others?

thanks in advance

projectRDM · 12-21-2008, 02:51 PM

The S14 fuel pump relay is ground triggered by the ECU, black/pink wire. The signal wire to the turn the pump on from the relay is black/yellow. That's your 'hot' wire.

The remaining wiring going into the tank is the fuel level float power, sender signal to the gauge, and grounds for the individual parts.

420sx · 12-21-2008, 02:54 PM

ok cool. i just wanted to confirm this. thanks!

i got my relay wired into 12v switched, along with other relays, ground to chassis and the hot wire goes straight to the fuel pump. i see that i wired it to the wrong wire. my friend used stock relay and thats why he hooked his up differently

dreibens · 03-03-2014, 07:30 PM

fast forward 6 years. was swapping these wires the solution to your fuel pump issue? I seem to have the same exact problem...

help would be amazing!

12-21-2008, 02:45 PM	#1
420sx Post Whore! Join Date: Jun 2004 Location: Texas Age: 38 Posts: 3,960 Trader Rating: (0) Rides Gallery: 420sx Feedback Score: 0 reviews	s14 fuel pump wiring, help ok i got everything hooked up to start the ls1, but i get no power to the Fuel pump. nothing, blank. i still need to flash the ecu but the pump should at least prime before ecu shuts off the relay there are several wires going from the fuel pump. im using an aftermarket relay, now my wire going to the fuel pump needs to be hooked up to 12v POWER wire. i hooked it up to black/red wire but pump will not come on. from reading up some more, i understand that nissan fuel pump is activated by the ground, and GM is activated by hot wire. QUESTION. what are the wire colors/ functions. the fucking FSM has no info on that and im can't find anything on this anywhere, all i find is relay and sr wiring which is useless to me. CLIFF NOTES: which one is power wire for the fuel pump? is it BLACK/YELLOW? what are the colors/functions of others? thanks in advance __________________ hydropgrahics! ls1......

12-21-2008, 02:51 PM	#2
projectRDM Post Whore! Join Date: Dec 2002 Location: Atlanta Age: 47 Posts: 13,812 Trader Rating: (12) Feedback Score: 12 reviews	The S14 fuel pump relay is ground triggered by the ECU, black/pink wire. The signal wire to the turn the pump on from the relay is black/yellow. That's your 'hot' wire. The remaining wiring going into the tank is the fuel level float power, sender signal to the gauge, and grounds for the individual parts. __________________ FORMERLY R240NA Learn what's really going on and protect your assets now before they're gone forever: www.paypalsucks.com

12-21-2008, 02:54 PM	#3
420sx Post Whore! Join Date: Jun 2004 Location: Texas Age: 38 Posts: 3,960 Trader Rating: (0) Rides Gallery: 420sx Feedback Score: 0 reviews	ok cool. i just wanted to confirm this. thanks! i got my relay wired into 12v switched, along with other relays, ground to chassis and the hot wire goes straight to the fuel pump. i see that i wired it to the wrong wire. my friend used stock relay and thats why he hooked his up differently __________________ hydropgrahics! ls1......

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03-03-2014, 07:30 PM	#4
dreibens Join Date: Sep 2013 Location: Stone Creek, OH Age: 31 Posts: 1 Trader Rating: (0) Feedback Score: 0 reviews	fast forward 6 years. was swapping these wires the solution to your fuel pump issue? I seem to have the same exact problem... help would be amazing!