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Curtis B.
Curtis B., Technician
Category: Small Engine
Satisfied Customers: 13581
Experience:  have worked on and around most engine models for 35 yrs./Polaris ATV expert
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We have a 1994 5100 toro mower. It starts just fine and runs

Customer Question

we have a 1994 5100 toro mower. It starts just fine and runs great for 20 minutes then sputters and dies. It will start and run again after it sets for a little while, it just wont keep running. Any idea what it might be.
Submitted: 1 year ago.
Category: Small Engine
Expert:  JohnF2015 replied 1 year ago.

Hi, my name is***** will be assisting you.

It sounds like you aren't getting a constant supply of fuel to keep the engine running. First thing that I would try is to remove the fuel cap and see if it will run any longer, if is does then the fuel tank vent is not working that is built into the fuel cap it may be plugged. The other thing that you can check is to see if you still have fuel in the carburetor bowl when the engine dies. The float or float valve may be sticking causing you to not get fuel to the carburetor in order to keep the engine running. When you first start the machine you have enough fuel in the bowl of the carburetor to run around 15 - 20 minutes even if the fuel tank were empty so it leads me to believe that you have a poor fuel supply coming to the carburetor.

Customer: replied 1 year ago.
This is a diesel engine. Does your answer hold true for a diesel?
Expert:  JohnF2015 replied 1 year ago.

No, sorry the diesel will not have a carburetor. But you could still have a fuel tank vent stopped up that would cause the problem. Can you tell what is happening at the fuel solenoid when the machine is running. I wonder if you might be loosing voltage to the fuel solenoid which would cause the solenoid to close and kill the engine. You might want to take a look at the fuel solenoid as well.

Customer: replied 1 year ago.
ok. we will try the fuel cap and check the solenoid. is the solenoid seperate from the fuel pump?
Expert:  JohnF2015 replied 1 year ago.

Yes, it is a separate item or part. On most diesels you will have an injector pump that pumps the fuel to the engine and through the injectors but the solenoid actually is attached to part of the fuel controls and holds controls open in order to run, if the solenoid doesn't hold the controls open then the engine will not run it can't get the fuel it needs.