fuel pump relay wiring help

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Aug 31, 2013 | 05:05 PM

crash

Thread Starter

Joined: Oct 2002

Posts: 1,751

Likes: 2

From: Santa Cruz

fuel pump relay wiring help

posed this over in engine management but figured you guys may know too

Quote:

Ok so I am rewiring my race car and I have a new fuse box that has built in relay spots.
I planned on using the ems to trigger the fuel pump relay and am having some issues.
I have the relay wired as such

30 ignition
85 ecu trigger A15
86 Kill Switch power
87 to pump

Am I doing this right?

Aug 31, 2013 | 09:03 PM

dsddcd

Joined: Feb 2008

Posts: 3,964

Likes: 7

From: USA

Based on what I can tell this may be a better configuration

Power to Pump
30 Kill Switch / Main Power Disconnect
87 or 87A to pump

Relay Coil
85 ECU trigger A15
86 Ground

Thought you were selling your car?

Sep 1, 2013 | 03:47 AM

Unbr3akable

Joined: Jul 2012

Posts: 103

Likes: 48

Is the ECU trigger a high or low when active? i.e. does it provide power or ground to the relay switch?

If the ECU trigger provides a ground when active, "Kill Switch Power" should be providing power (i.e. battery voltage).

If the ECU trigger provides power when active, "Kill Switch Power" should be providing a ground.

Hope this helps,
Caleb