The Dubro tank should be fine as long as you're running a DZ. All YS DZ engines use a true fuel pump rather than the pressurized tank/regulator setup. Also I would be careful about making that clunk too rigid to the back of the tank, it should be free to flop around a little. The DZ requires constant fuel flow in order to keep running. The foam on the YS clunk helps with that, but if the clunk loses contact with the fuel for too long you can end up running your engine extremely lean for a second, potentially causing damage to it. This is the "burp" that DZ owners always talk about at the end of a tank. You should always avoid running your DZ dry, because it will make it more difficult to restart because the pump must be re-primed, and it could cause internal damage. I personally am using a 20 oz Tettra tank, and I have the YS clunk on silicone fuel tubing that runs probably 2/3 to 3/4 the length of the tank. I run my 1.40 DZ with no problems whatsoever in regards to fuel flow and I can fly until the tank is almost dry before I get a "burp".