Originally Posted By kielbasa


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?


Fairly recent and limited to high end/high output cars. I would bet the reason for it is that much fuel requires a big pump, and reducing output via pwm is more to do with lowering noise and extending pump life by running the motor slower than it is anything to do with fuel heat.