Small Engines (Lawn Mowers, etc.): fuel solenoid, lt1000, gas tank

Question
John, on 8/19 you helped a gentleman with a problem where his mower would just stop after about 10 minutes. You suggested checking the fuel solenoid. I have a Sears LT1000 with a B&S 31P777 that I just bought used. Mine does the same thing except initially it might run for approx. 20 min then it stops more frequently. What exactly does that solenoid do? I cleaned the carb and saw how it works but is it necessary for operation of the engine? In other words, why can't I remove it altogether? Thanks for your help...Nick

Answer
Hello Nick:

The Purpose of the Carburetor Solenoid is to Shut Off the Gas Flow to the Main Jet. This is Supposed to Assist in Preventing the Engine from Flooding when the Engine is Not in Use. I Usually Suggest you Check the Following in this Order for a Problem like yours. 1- Check the Gas Tank Cap and Ensure it is Venting the Tank. A Vacuum Builds in the Tank and the Gas Flow Stops or Slows to a Point it Shuts Off the Engine. 2- Operate the Equipment Until it Quits (15 to 20min). Then Immediately Check for Fire from the Plug. If the Plug is Firing, then 3- Check the Carburetor Solenoid. If the Carburetor Shut Off Solenoid has Current, then Remove the Carburetor Solenoid and Go to the Hardware Store. Purchase a Bolt of the Same Diameter and Threads. It Needs to be 3/4" Long. Put this Bolt in Place of the Solenoid. If this Corrects the Engine Problem, then Replace the Solenoid. ***NOTE: THIS IS FOR CHECKING THE SOLENOID ONLY I NEVER SUGGEST YOU OPERATE THE ENGINE WITH THE SOLENOID OUT OF THE CARBURETOR EXCEPT FOR TESTING PURPOSES*** Sometimes the Plunger is Moving, Just Not Far Enough to Allow the Gas to Enter the Jets. 4- Depending on the Model Mower, it can Also be the Pickup Tube in the Gas Tank. Hope this Helps. I am Here if You Require More Assistance. Let me Know What Happens, Please. Thanks.

Good Luck

Respectfully

John

PS: I am Allowed to Answer 10 Questions a Day. If you See I am Maxxed Out, then Try Submitting your Question at or Just After 9pm EST (US). My New Day Starts then. Thanks.

Respectfully

John