Please try to explain it more clearly try adding pictures or a paragraph explaining what are you doing and how is this whole pipe thing working also PLEASE tell what version you are using of buildcraft!
It should not be requesting any kind of powering unless you somehow extracting energy from a chest. And what item are you trying to whitelist because white will only allow those items to go through while a blacklist will prevent those items from going through.
If you did not understand what I said here is a example
If you see a blackpaper that means it is on blacklist mode will prevent those items going through and if you see a whitepaper that means it is on whitelist mode, Also to change modes simply click the on paper to switch to desired which you look like you want to extract one item so go ahead use the whitelist if that doesn't then please take a picture!