George has your answer. The next thing to be sure of is that for a control line installation, the beveled end of the pickup tube is tucked just above the lower outboard tank retainer screw. There is a stiffening gusset on the backplate there that you can poke it under. The bevel should be oriented so that the end of the tube is open right down in the inside corner of the backplate. (Side to back corner.) If the spring is sticking out far enough to prevent tucking the pickup tube into the corner, either work the spring in farther, or snip off the piece that is exposed. The tanks are small, and you want "good to the last drop" operation.
Best wishes to Baraboo, where I understand they have the highest per capita of control line flyers anywhere in the nation--something like 1 in 12,000 is a CL fanatic!
Divot
PS--a perhaps redundant reminder: if you ever replace a vinyl pickup tube on an engine with a plastic backplate, if the tubing has been on for a while and has become hard, shave down the tubing over the nipple before trying to pull/twist it off. Else, the nipple will break off the backplate. And the rebuild becomes a lot more pricey--or may end your day of flying.....