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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14899
Experience:  Certified on Onan and Generac generators
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I have an Onan K3500 It starts and runs for 15-20seconds and

Customer Question

i have an Onan K3500 It starts and runs for 15-20seconds and quits.Carb has been rebuilt.Fuel tank has been removed and cleaned along with fuel shut off valve.Fuel filter has been replaced.New spark plug.can you help?
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: Yes to both questions
JA: Do you plan on doing the work yourself?
Customer: All work was done by a highly skilled auto mech.
JA: Anything else we should know to help you best?
Customer: no
Submitted: 8 months ago.
Category: Small Engine
Expert:  Hank F. replied 8 months ago.

The first thing you need to do is to determine if this is a fuel or a spark issue.

Is it acting like it is running out of fuel?