Mike,

This is how the the CB-Tatone test stand should be constructed.

Do it right!

The aluminium tube is for fuel pickup to the engine.
The two black nylon nipples are for exhaust pressure and tank fill/refill.

The tank is wrapped in latex foam, to prevent fuel foaming.
A tie wrap binds it to the included tie bracket on the 2"x6", which can be attached to a table with a large C-clamp.

Your setup cannot work properly. Fuel level changes will cause mixture strength changes, from very rich to very lean.

Do not use it as it is built now!

Re-arrange it completely.