Whats the switch on the bottom of carbburator bowl

I honestly can't think of any two wire switch I've seen in the past on the carburetor linkage.

Many have a kill switch on the carburetor linkage. But this is just a single wire that grounds out when the throttle is thrown to the fully closed position.

On the carburetor itself there can be a fuel cutoff solenoid. This can be either a main jet supply or fuel inlet supply, I've seen both. This piece is almost always a single wire unit, grounding through the carburetor body.

The purpose of the needle is to ensure a clean shutdown and no runon or dieseling when you kill the engine, by stopping the fuel flow in the carb.

I found the neighbors very gummed up with green gum from the gas, Remove it and carefully cleaned the needle and the bore with scotchbrite and it worked OK for about a year. Then it got to working intermittently and this was the old type without a ground wire, used the carb for a ground. I ended up replacing it with a new one, that had a ground wire. Works great now, makes a loud click sound when you turn the key switch on.

Jacks Small Engines has illustrated parts books for the Briggs engines online. You need the model number off the engine. A little tedious to wade thru and slow, you need a broadband connection, but you can find all the parts you need. You also need to know what brand of carb you have for most engines, such as Nikki, look on the carb for the name cast into it.

Charles

That solenoid doesn't stop fuel from entering the carb. Only from entering the main jet. If you have a leaking float valve (which is what stops the fuel from entering the carb), it'll overflow the bowl, and then run in to the engine and flood the cylinders.

In order for that solenoid to stop fuel from entering the carb, it would have to be mounted where the fuel line enters the carb, and not on the bottom of the bowl.

The inline fuel shutoff is the best cure for this problem, other than replacing the needle valve and set or the float if necessary. The inline shut off guarantees the flow has stopped, as long as you remember to close it of course.