BMW STG1 Fuel System Wiring Kit (M240, M340, M3, M4, X3M)

Single pump wiring kit designed to activate the secondary fuel pump in our BMW STG1 Fuel System Kit.

This harness integrates our STG1 Fuel System Upgrade with our ReFlex Sequential Port Injection Kit, allowing ReFlex to control activation of the second in-tank fuel pump. For customers not running ReFlex, a Hobbs switch can be added to trigger the fuel pump relay based on boost pressure.

Compatible with our STG1 Fuel System Upgrade on the following platforms:
G20 M340i and G42 M240i (B58)
G80 M3 and G82 M4 (S58)
F97 X3M and F98 X4M (S58)