Never heard of that one before but looks allright.

I wonder if the higher the pump rating as in 255, 30 , 340, 400...it means that if I put a higher rated faster flowing pump that my fuel consumption will go high too, as in if I used to get 400-500 km per tank I'll get like 200-300...
Or will it just pump the amount required by the engine depending on how I'm driving? I'm a bit lost by how that goes.