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Old 05-29-2013, 01:02 PM   #1
DEMoLITIoN
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Default External Fuel Pump Relay Wiring.

Hey guys, I need some help wiring up an external fuel pump relay and can't seem to get it right. I've searched and found some information on the vortech relay, but it seems that information could be wrong.

Motor: 2004 DE

According to the FSM, ECU pin 113 controls the on/off for the current relay. I would like to have it operate the same way. Is this a way for me to maintain that? I know I can easily wire it to a manual switch, but I want the ECU to do the switching.

What I have so far. Does this look correct to anyone?

SPDT Relay pins:
30 - From ECU pin 113
87a - [Not Used]
87 - To Fuel Pump
86 - IGN +
85 - Ground

Stock Setup: (sorry for the lame diagram)
12V From "On" or "Start"---|~coil ~|--To ECU Pin 113
15A Fused from IGN Relay--|*____*|--To Fuel Pump Pin 1


Any help is greatly appreciated. Thanks in Advance.
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Last edited by DEMoLITIoN; 05-29-2013 at 01:09 PM.
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Old 05-29-2013, 02:26 PM   #2
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do not wire like you stated above, ecu will be powering the pump directly and can not handle the current.

take the power wire from the original pump hook it to pin 85, ground pin 86.
12v battery (fuse at battery) pin 87
fuel pump to pin 30
gound - on the fuel pump



Wiring this way will work like stock and handle the current. be sure and use wire that can handle the current.
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Old 05-29-2013, 05:53 PM   #3
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I am using an external relay with a drop in walbro. I am not actually doing an external fuel pump.
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Old 05-30-2013, 08:04 AM   #4
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According to Vortech, This is how it should be wired:

30 - Chassis Ground and to ECU
87a - [Not Used]
87 - To Fuel pump Ground -
86 - To Battery and Fuel pump +
85 - To ECU
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Old 06-01-2013, 07:10 AM   #5
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Just put the relay back under the seat at the connection to the fuel pump. Use a 12v tester check which wire turns on when the ignition is on and use that for your activation of the relay. If i remember correctly it was yellow and black.
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Old 06-01-2013, 07:10 AM
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2003, 350z, fuel, nissan, pump, relay



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