Just bought a 10 oz tank, cut and installed the tubing and klunk according to instruction. After fitting, I found that when I position the tank vertically with the rubber stopper at the bottom, the klunk doesn't want to drop to the bottom !! Is the tubing too stiff or the klunk too light ??? Has anyone faced similar problems and how did you solve it ? I surely would'nt want to see my engine fuel starved on a steep dive...............