John Deere L110 won't start.

There is a John Deere 110 and also a John Deere L110, two totally different tractors. You have the L110 . Because the fuel tank is under the seat and lower then the engine it has a fuel pump on the engine to lift the fuel and fill the carburetor.There will also be a fuel filter. This engine is a Kohler Command vertical CV491S.It has a mechanical fuel pump that is driven from the cam shaft lob. It is mounted on the opposite side of the carburetor on the engine.
When the engine is spinning it pumps fuel to the carburetor. On the bottom of the carburetor there is a fuel solenoid with wires hanging out of it.

Its job is when you turn the key on it pulls a plunger down and lets fuel feed the main jet in the carburetor and when you turn the tractor off it goes back up and plugs the hole to stop the gas from feeding the main jet. If this was not on there and you had it at operating temperature at higher rpm and shut it off the gas would go into the cylinder and be ignited by the glowing red carbon deposits and back fire possibly breaking the crankshaft rod. `
Remove the spark plug wire and stuff it in a glove to make sure we have no surprises.I would start by removing the fuel hose from the carburetor and placing in a bottle and crank the engine to see if fuel came out of the hose, if not I would change the fuel filter or at least remove it and blow backwards through it to make sure it is not plugged then replace it and crank again looking for fuel at the hose in the bottle. If you still have no fuel then I would replace the fuel pump. If you had fuel at the hose on the test then you need to place your ear close to the fuel solenoid on the bottom of the carb and list for a click sound when you cycle the key off and on.This would be the plugger opening and shutting as the key is cycled. If there is no clicking you need to check for current at the wire feeding the solenoid with a test light. Let us know what you find.

Sounds like a faulty fuel pump.Did you check that?

are you getting spark?is it getting fuel threw the carb

if the engine doesn't spin look at the starter if it has spark and a new carb is there power to the solenoid on the bottom of the carb does it fire on carb cleaner?

is the primer working ? have you tried the self primer if fitted ? when you turn over the engine is the bubbles in the fuel viewer or does it just drop. or something else.

If the engine surges and won't run without choke it is starving for fuel. Best place to start is the fuel filter. After the fuel filter, pull the fuel line off of the carburetor and place a container under the fuel line to catch the fuel. Crank the engine over and watch for the amount of fuel being pumped through the line. There should be a good stream of fuel with each pulse from the pump. Chances are the pump diaphragm is getting weak and it cannot keep enough fuel in the carb to run proper. Check those items and let me know if it helps, Daniel.

Hi, disassemble and clean all jets in the carby, also check the valve clearances are correct because if they too tight the engine will not draw fuel in. Hope this helps, regards Phil.

Has it been outside? May be water in the fuel.

The ignition switch module is likely to be the problem,they seem to quit for no good reason.The safety relays and fuses are built into the board that comes with the switch and will most likely fix your problem.

I have a 115 john deere tractor that runs but the engine will not run smooth I've put a new fuel cap on it a new pump and clean out the carb.