Hello, my name is ***** ***** I am going to assist you with this.
This unit will not run if it is not producing power, so it is producing power.
As such, there are only a couple of possibilities here:
1. The circuit breaker on the genset is tripped. Check it out, and reset if necessary.
2. You have a broken connection between the genset and the receptacle. I can not tell if your pigtail goes directly to the receptacle, or if there is a junction box in between. The pigtail is only 3 feet long, so if the receptacle is further than 3 feet away, there is a junction box. Both the junction box and the receptacle are common places for connections to have come loose. Check both very carefully (if you have both).
3. The receptacle itself is bad. This would be very rare, but can happen. Remove the receptacle from the electrical box, and test for gen input into the back of the receptacle. If you have good power going in, but none coming out, the receptacle is bad.
By the way - this unit does not "idle up" when a load is applied. This is a constant speed genset, and runs at the same speed whether there is no load on it, or if it is a full load.