The return regulators near the tank with a deadhead line to the engine compartment are nice, but it is still much better to use PWM to control and match the power to the pump to engine demand in any of these systems. [/quote]

Wondering if this variable pump output is a fairly new development, or has automotive been doing this for some time? If so, do all cars use this type of fuel pump system, or limited to high end and/or expensive cars?