Also, some have an electronic stepper motor governor and some use a mechanical governor. Do you know which yours has?
If it runs fine in regular mode, that probably rules out fuel flow issues. (As far as a restriction)
Except...in regular mode it runs on the Main Jet and in ECO mode it can fluctuate between the Pilot jet and transfer ports and Main jet.
Run it in ECO mode until it shuts off. Pull the spark plug. Is it wet? Oily?
Possibly the roll over whacked the float level out of adjustment and when it runs in ECO mode it slowly floods the motor with too much fuel. whereas in Regular mode there is enough airflow and heat to compensate
If nothing there....
Unplug the oil sensor (after making sure you have the correct amount of oil in it) and see if it still shuts off.
Lastly and most importantly.....never loan out your tools. They ALWAYS come back broken ;-)
To clarify - I'm not a Predator, but one of my Generators IS
HarborFreight Predator 3500 Inverter
Last edited by Predator; 07-25-2019 at 12:10 AM.