I rebuild my motor and now the fuel pump will not pump. I don't think i'm getting enough crank case pressure to make the pump work is there a way to check this? I have pulling the outlet tube side of the pump and it is pumping fuel but it will not push it up to the carb. What can i do to fix this? I have bought a new pump and it still does the some thing. All the lines are free of kinks as well.