carb solenoid

[Norm Wampler]

Thanks to you guys who replied to my question. I am still working on my tractor and had a question about the solenoid on the bottom of the carburetor. The wire is bad going to it and is touching the metal sleeve going into the solenoid. I have tried liquid tape and it inst working. I took it off to look at it and someone has already removed the pin or plunger. There is just a hole. I unplugged it, and now my tractor wont start at all. What exactly does the solenoid do and is it necessary? I guess since it wont start, it is??????? I am beginning to think I should have just took the tractor to someone who knew what they were doing!!!!Any help would be appreciated.
Thanks,
Norm

 

[mmfan55]

Most solenoids i have seen shuts fuel off from entering "jets" .
You should be able to remove it and screw a plug in it's place

 

[Tom in TN]

Norm,

On at least some applications, that solenoid is referred to as an "anti-run-on" or an "anti-backfire" solenoid. It shuts off the supply of gasoline to the carburetor when the ignition switch is turned off so the carburetor won't continue to allow fuel/air mixture to be drawn into the engine when the ignition is off.

As mmfan said, some guys simply remove the solenoid and replace it with a plug on the bottom of the carburetor, thus, eliminating its function entirely. Personally, I'd look for a new solenoid and replace the old one.

Tom in TN

 

[Steve@Advance]

The solenoid shuts off the fuel to the engine when you cut the ignition power. The purpose is to prevent hot start exhaust backfire, engine run on when shut off, and raw gas from being blown out the exhaust while te engine coasts down. You can overcome all this by always idling the engine down before shutting it off, and leaving it in gear to kill it with the clutch if it tries to run on.

There is probably a metal or neoprene tip on the plunger. You can cut it off, or pull the spring out so it won't shut off the fuel. Then you can screw it back in and leave it unplugged.

 

[Geo-TH,In]

The carb solenoid really isn't necessary. I have an old kohler on a craftsman. I held the solenoid open with a paper clip. Been working for years.

As far as solenoid preventing backfiring in muffler and dieseling, it's a joke.

I can remove the power to the solenoid on my 20 hp Kohler command and it will keep running at high speed indefinately. If I idle it down and it takes about 3-5 seconds for engine to die.

Remove the power to solenoid on a 20 hp Honda and it will run for about the same time, but stop regardless if it running fast or slow.

I turn my engines off by removing power to solenoid and running engine out of gas. This prevents all possibilities of backfiring or dieseling that will occur if you stop engine by killing spark.