Carl, the spacer is NOT the answer to stopping the raw fuel from going into the engine. If this is your goal, then you need to install a "return line" for the fuel.
In a nutshell, this would be one size smaller (if your fuel line is 5/16, then this one would be 1/4) line that "tees" off of the existing fuel line right where the fuel line enters the carburetor and runs ALL THE WAY BACK TO AND DUMPS INTO THE TOP OF THE FUEL TANK.
Adding such a line will not permit the line pressure to overdrive the carburetor fuel valve, thus the extra fuel is not dumped into the carburetor.
Jon.
