I tried to find on several online stores a quick filler valve to place between the fuel bag and the engine but i couldnt find any available so i was considering on making one, can anyone help me find one or explain how to do one?

This is what a lot of us use, they also have T's. THis is where I get mine. Ron



www.pspmfg.com/FuelDotsRegular.html

Going with a T or Y fitting as Ron stated is the way to go with gas bag setups in my opinion...fool proof and economical...no air leaks.