Originally Posted by bob

I believe a normal pump operates at a constant speed when it gets 12+ volts. So at idle, it may be pumping at a rate exceeding what you require at idle, creating excess pressure and subsequently heat. However, at WOT you may need that flow capacity. Some pumps provide a controller that allows you to reduce the current flow to the pump at lower rpm or loads when you don't need the fuel flow but are able to increase their flow capacity at WOT or higher load demands.

Originally Posted by AllDodge

I understand that part, my questions comes from so many use the pump that in no way have the HP which needs that much flow. At best they may use 1/2 of what it can supply