I thought it might be on it's way out as I had trouble starting it, seems to be a lack of fuel, the engine is turning over and it's getting a spark, I sprayed a bit of easy start in the carb and I caught instantly, I've already changed the inline fuel filter as it looked like it had been on there since the engine was rebuilt in 04, been looking at videos on websites and most say the diaphragm perishes eventually. Do you think it could be anything else, the carb is a Weber