Hi.

I have bought 100 meters of 4mm inner diameter drip pipe. I attached to this my mini brush-less 12V pump but there's hardly any water coming on the other end. I must admit it is quite a run of cable. Have I gone wrong with the pump I have chosen?

Are there any calculations as to what pump should I have got in order to have a steady flow of water on the other end?

Many thanks in advance.

Albert