The carb you've got now is probably in better shape than any "rebuilt" you can buy, assuming it's the right application for your engine in the first place. Since your other thread on this subject says it runs OK with the electric pump, better check out the mechanical pump to see if maybe you got a lemon- - - - -it happens! Remove the fuel line at the carburetor, and run the gas into a catch container of some sort. Start the engine and let it idle- - - -it should run for a minute or more on the fuel in the float bowl, and measure the output. A good pump will produce at least a pint in 30 seconds. Now, check the pressure: deadhead the pump into a fuel pressure gauge, and run the engine. The pump should produce 2-4 PSI, minimum, and the pressure should hold for 30 seconds or so after you shut the engine down. On the inlet side, attach a vacuum gauge, run the engine, and look for 12-15 inches of vacuum, and a "hold" for a few seconds after shutdown. A failure of the volume test with good results otherwise should send you looking for a restriction upstream of the pump like a clogged fuel tank pickup, collapsed flex line, air leaks between the tank and the pump, etc.
Jerry
