I have a push mower, 3 1/2 briggs that was put away without gas and not run for a couple years. I squirted some starter fluid in the carb and it fires up but won't run on it's on. the priming bulb doesn't feel like it is working and feels like no suction. I took the carb apart and cleaned the jets and all is open and clean but still won't run on it's on. I am thinking diaphragm, how do i change that. I didn't see anything that came apart?

My Craftsman riding mower model #917-287210 is possessed.:madhell: The carb floods the motor to the point it fills the cylinder even when sitting. I tried to start it for the first time this year and the engine wouldn't crank. It was like the battery was dead. It would try to turn over but hit a point and stop. I pulled the plug to check for fire and when I cranked the motor raw gas by the ton came out the cylinder. I put the plug back in and tried to start it, it did start but I could tell it was way too rich, not running well and occasionally smoking. It died and checked the plug and it was very wet. Cranked the motor again with the plug out and more raw gas came out the cylinder and the air filter, I had removed. WTH There is an electrical connection on the bottom of the carb bowl, is that a solenoid of some kind and could it be stuck somehow causing the carb to flood the motor? I don't think it has a fuel pump, it is a 21 HP B/S motor, I think. I know it's not a Kohler like my other mower. I guess I will pull the carb and see if the float valve, if there is one, is stuck. The owners manual and Sears parts diagram don't list the carb so I'm guessing in the dark. I did notice the oil was very thin when I changed it also so my guess is gas got the oil somehow. Any help would be appreciated. Sorry for the lengthy first post:wall: