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Ok, i'm gonna buy another HPFP and report back.

Hello guys, this is my first post and also my first Mazdaspeed 3, I got a problem and i'm out of ideas; my HPFP is not running, I can't hear it, I checked the voltage from the connector to ECU and it reads 8 volts. My car is just running with the fuel pressure from the pump in tank. I connected...

Do you ever find the solution? I have P0091 code and i'm lost, I have good fuel pressure readings from both fuel pumps, checked grounds, shorts, open circuit and nothing...