JeremyH
3V Fuel Guru
Baps have a hum to them you can hear when energized, much like a transformer hums, you wont hear it unless the car is off and your looking for it. It's normal and nothing to be concerned about.
I've never noticed a hum with mine and being into audio as well I'm a bit surprised I haven't if that's standard fare. I know it's working though or I'd have already done the forged thing... lol
Might it be that I don't hear mine because it doesn't "energize" until activated by the hobbs switch so I just can't here it until I'm into boost?
Like I mentioned you have to look for the hum and I canly only ever hear it when the car is off and just the key is on.
Depends on how you have it wired, the bap is energized when the car is on regardless of how much voltage the fpdm is actually allowing to go to the pump.