Originally Posted by TechnicZ

Ok from what you said:
-You have no power coming from the wires that are supposed to supply power.
-You made sure your multi-meter was on a good ground source to give you an accurate reading.
-Main fuel pump fuse is good.

Questions:
-Is there another fuse supplied by BP kit?

My next steps would be:
-Make sure fuel pump relay is good
-Make sure there's no opens (breaks) in the wiring that was installed there by doing a continuity test from source to fuel pump (make sure to isolate the wiring)
-Make sure the ground wire is good. No ground = not a complete circuit for amperage to travel.

Good luck! Definitely try and contact BP.