It is a little confusing on the new fuel cell pumps. The instructions show how to wire them and program the ECU for a pump controller, but when I talked to Holley tech they said that the pumps available now are not PWM. Sounds like they do have PWM pumps coming out in the near future.

The instructions show that if you ground the yellow wire on the pump then the pump runs at 50% capacity. There are some details showing how to program the ECU so that the pump runs at 50% unless the TPS is greater than 50% and then the pump goes 100%. So basically you can program it so when the throttle is wide open the pump is on full. Or if the nitrous is on then the fuel pump is on full.