Small Engines (Lawn Mowers, etc.)/fuel solenoid


I have a 20 hp kohler courage the fuel solenoid gets hot to touch with the key in the on position, does this mean it is bad it want start on its own I have to spray gas in carb a couple of times and it will stay running , the fuel solenoid also gets hot


Hot is difficult to judge as they can get hot just from the hot temperature.  However, since you can get it to start by priming then I would suspect the solenoid is not working...has a similar problem once.

From the Kohler manual:

Fuel Shut-off Solenoid (Optional)Some gasoline-fueled engines are equipped with the optional fuel shut-off solenoid, which is installed in place of the bowl retaining screw, to eliminate
backfiring when the engine is shut down. If a solenoidequipped engine will not start, check whether sufficient voltage is reaching the solenoid. A minimum of 7.3 volts DC is required to activate the solenoid. Also check to see that the ground lead from the carburetor body to the air cleaner base mounting stud is properly connected.

If these check out, the solenoid should be removed for bench testing. Remember to shut off fuel supply and catch any fuel spilling from the carburetor as the solenoid is removed.
Bench test the solenoid by grounding the solenoid case and applying 12 volt DC to the spade terminal. If the plunger does not retract in this test, the solenoid is faulty and must be replaced. Always use a new fuel bowl gasket whenever the solenoid is installed.

Make sure the ground on the engine is good.  This was this issue with the engine I had that had the same symptom you are having.


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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