Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi Mike, my name is***** will be assisting you.
When you say it immediately shuts off, Is that when you release the start button?
You have one of a couple possible problems.
Either the run relay is bad and not keeping everything energized in order to keep the machine running or the unit is not producing any AC voltage which will cause the relay to not latch therefore it will not continue to run or operate. I would first check the unit for AC output, it will not be easy unless you can get an extra pair of hands to help you. You will need to be able to check for voltage output when the machine is operating. If you have voltage output when the unit is attempting to run then I would replace the run relay.
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You will need to attach your voltmeter to the unit and test voltage output while you are cranking the engine or trying to start the machine. It is sometimes difficult to get a good reading when the machine won't fire up and run for at least a little bit but you should be able to get and indication of whether it is working or by testing while you are cranking the engine.