I need a 7 oz tank and this is the only one that will fit in my tank compartment. My question is how can I determine the pickup location
on this type of tank it needs to be lower than the center to the tank about where the seamless is stamped
I don't really understand the question, but...
The pickup just moves around under acceleration, so the average pickup location is the center of the tank, and on suction, that's how it operates in terms of vertical location. If you can't move the tank, make it a uniflow with a rigid vent, and then rotate it up or down by twisting it in the stopper to adjust the run.
Brett