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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14436
Experience:  Certified on Onan and Generac generators
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I have a Emerald III gen set and it starts but won't run. As

Customer Question

I have a Emerald III gen set and it starts but won't run. As long as you hold the start button down it runs, once you release the button she dies.
JA: Do you have fuel in the tank? If so, is the shut-off valve open and the fuel clean?
Customer: The tank is a gas can on the side and the fuel switch is on, like I said it continues to run with the start button pressed, but then dies when released.
JA: Do you plan on doing the work yourself?
Customer: I will or my son will
JA: Anything else we should know to help you best?
Customer: i was thinking it could be in the circuit board.
Submitted: 23 days ago.
Category: Small Engine
Expert:  Hank F. replied 23 days ago.

The single most common cause of this issue is that the set is no longer producing electricity.

The first thing you need to do, though, is to check your oil level and make sure it is full.
Low oil pressure will also shut the set down.

If the oil is good, remove the control panel from the front of the genset.
Set your meter to ACV.
Connect the black lead to a good ground.
Connect the red lead to the back of the circuit breaker (either one), on the terminal farthest away from you.
Press and hold the start button for 6 - 8 seconds, and note the voltage.
How much voltage is there?