Buildcraft version: 7.99.12
Forge version: 2549
Link to crashreport or log (on pastebin or gist, please don't put the entire log here) :
Singleplayer/multiplayer:

Additional information:
As talked about in the discord, there doesn't seem to be a config option for pumps to actually remove the water which is a balancing issue when water is set to finite in a pack. It would be nice if you could add that config option. Thanks very much.

Added in e1b097c, will be released in 7.99.13.