1Q, considering the prices I have seen in some blogs, it seems that savaging a Walbro carb makes a lot of sense. However, I have looked to the weedeater carbs, and cannot figure our the size and connections to the pressure pump/regulator. The whole carb is 2 x 2 in, which is something I cannot afford. About the pressure in the tank, are we talking muffler pressure or something else? (never assume, you know).