I have a John Deere L111 with a B & S Intek 20hp V twin engine, I looked at previously asked Q&A and went through the fuel system from the gas tank through to the fuel pump, all which are working great, it still will not start. I took a tblspn of gas as suggested, it started briefly then stopped. The only thing I have left to check is the carb. I'm not sure if it has a solenoid or not. Could you please advise appropriately. I'm stuck. Any positive help greatly appreciated. Thanks

Are you referring to the fuel anti fire device, commonly known as the fuel solenoid? If so, you can remove it from the carb, hook it up, ground the side of the housing of the fuel solenoid to the engine, and just turn the ignition key, it should click and move. If not, it is either the fuel solenoid, or the wiring to the solenoid. Now, if you have not checked the carb. That is about 98% of the reasons a mower that used to run will not run anymore. Clean the carb.