Well when trying to remove return line from tank to fix leak i broke the line off the fuel tank.So to drain the fuel out so i could drop the tank i pt a hose on the return line and stuck it it in a 5gal jug started truck and fuel pumps into jug when the fuel return line was submerged a air bubbles could be seen coming out so is this normal? Or is it a sign of air entering the suction side? tnx 058hamer