Quarry wont work

[iTzREAPER]

ok so i have watched many tuts on how to make quarrys but the quarry will never do anything. It wont even build itself. i get to the point were you got the yellow lines marking out were the quarry will be built and i add a combustion engine get it running and everything but it wont start to build itself. Could there be something wrong with the build craft mod? and how would i go about fixing it?

[SinXX]

type /op [buildCraft]

[iTzREAPER]

Thanks it works now much appreciated.