Yes, I have these generators and several others.
You MUST add a fuel stabilizer to the fuel. The factory warranty depends on it.
After your warranty expires, it'sjust as important
The BEST fuel stabilizer you can use in your generator is STA-BIL 360 Marine. It is blue colored like Aviation 100LL fuel.
Read up on it and you'll understand.
Everything else is 2nd best.
To clarify - I'm not a Predator, but one of my Generators IS
HarborFreight Predator 3500 Inverter
Last edited by Predator; 10-11-2019 at 03:25 PM.