So I decided to get a rebuilt carburetor. I got it from National Carburetors in Jacksonville, FL, which does only carburetors. I also got to watch them test it on an engine and it ran well. I didn't want to do this. My original, which I rebuilt 11 years ago, never gave me any trouble until recently and there were so many unknowns with it that I thought it would be wise to start from scratch. I installed the new carb but there's still a problem. It stalls at idle, runs rough, accelerates rough, etc. Its running really rich and the spark plugs are fouled black, which was the case with the old carburetor, too. It runs best when the idle mixture screw is turned all the way in and seated, which obviously it should not and which tells me it's getting WAY too much fuel. i looked down the throat of the carb with the engine running to see if there was gas dribbling down the throat and it is not. So both old and new carburetors produce the same effect which tells me I need to look . . . where? The fuel pump? Could it be delivering too much pressure?
