I have a Kohler Command model #CV730s. It doesn't seem to be getting fuel. How can I check if the fuel pump is bad? Also my fuel shut off solenoid looked a little chewed up so I put one on from an old engine and now the fuel just flows out of the carb and drips all over. Could that solenoid be bad (the one from the old engine) and the original one good? Any help would be appreciated!!!!