If you put the oil lines on back to front, the oil filter acts as a 1-way valve stopping oil getting to your engine.
Outer feed is oil in (from the pump), centre is oil out to the bearings etc
If the oil is fed into the filter through the centre, the rubber flap will stop pressure getting to the engine.
Double check that the outer feed from the pump on the sandwitch block it fitted to the outer feed to the filter on the remote housing,
Likewise the center feed to the bearings is connected to the filter outlet (centre) fitting on the remote housing.
Hope that helps.