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The pressure pump for the gasoline tank, located on the lower left side of the engine crankcase, has a small square head screw on the top which is held in place by a hex jam nut. Loosen the jam nut, turn the screw in to decrease pressure and out to increase pressure. However, it appears that there is a problem with the needle valve in the float chamber leaking. It should not leak even at six pounds pressure. Take some fine compound such as jeweler’s rouge and re-seat the needle and also check the float level at the notch in the pin at the sight hole in the side of the carburetor float chamber.