LS3 Fuel Pump control

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Nov 1, 2014 | 10:27 AM

mikes50

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From: Sunnyvale California

LS3 Fuel Pump control

Wondering if the GMPP connect and cruise LS3 ECU has PWM fuel pump control.
Planning on running an Aeromotive Phantom fuel pump.

Thanks
Mike

Nov 12, 2014 | 11:20 PM

Avanti

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From: North Louisiana

I cannot speak directly to the "Connect & Cruise" 'puter, but the LS3 ERod DOES--two wires leave the harness together, blue for fan and gray for the fuel pump. Sorry I couldn't be more specific to your application.

Nov 30, 2025 | 10:30 AM

G Atsma

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Dec 1, 2025 | 10:01 PM

ProServ

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From: Indiana

PWM pump control

Direct PWM control of the pump for pump speed/flow/pressure control from the ECU is not used on any LS V8 applications that I am aware of. An external fuel pump control module (FPCM) would be needed and it would need to be enabled in the software. The connect and cruise & other GM/Chevy Performance Parts crate engine ECU and harness systems expect a fixed pressure fuel system with a 4 bar/58 psi mechanical regulator (that is not vacuum referenced).

https://www.chevrolet.com/content/da...except-lc9.pdf

The E-rod harness controls the relay to enable the pump but it is not PWM controlling the pump. It is just enabling the relay on power up and disabling the relay on power down. They do not vary pump voltage to control pump speed to perform closed loop pressure control.

https://www.chevrolet.com/content/da...d-17-tooth.pdf

Quote:

Originally Posted by mikes50

Wondering if the GMPP connect and cruise LS3 ECU has PWM fuel pump control.
Planning on running an Aeromotive Phantom fuel pump.

Thanks
Mike

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