Fuel pump runs at full speed when the engine is on:

Check these: Adjust the fuel pressure via the small screw on the side of the box.
Check fuel pressure sensor wiring connections. On the fuel pressure sensor plug Pin 1 = Brown, Pin 2 = Black,
Pin 3 = Grey. Confirm that these wires align with the same wires on the controller GT150 plug. It is possible to
crimp across the insulation of the wire and not obtain a good circuit pathway, hence, causing a controller
malfunction.
Confirm that the input and output main power wires from the battery and to the fuel module are correct/not
reversed.
Confirm the controller is connected directly to battery power. No chassis grounds.