Air in Plumbing System

I take it, your pump is above the water tank like mine is. Everything between the tank and pump have to be perfectly tight. I drilled out the suction screen in the outlet of my tank and put a suction strainer right on the pump inlet and I was surprised at how tight I had to twist that strainer and bowl so it wouldn't suck any air. Another, even worse problem was a brass barb/plastic tubing connection (where it went from pex to soft tubing) just ahead of the strainer. The worm clamp was one size too big and it distorted the tube and it created a leak around the barb rather than stopping it. Craig