After 8 months, I am finally able to report that I replaced the fuel pump, fuel filter, and air filter, and all is well.
A few days ago when installing my new Alcoa wheels and flushing my brake system, I ran the generator to see if my "Runs For 20 Minutes, Then Dies"
problem continued, and it repeated just as predicted. Many months ago, I ordered the new parts, waiting for an opportune time to install them.
Wow, the project was a challenge for me. This morning I still have indents on my right forearm. I had to disconnect so much wiring and pull the wires and cables out from the compartment, just to be able to remove the solenoid, followed by the control board unit. There is a connector with maybe 30 wires that plugs to the underside of the control board that is very hard to disconnect because of the confined work area. Once disconnected, I was able to work it out with determination. With the cables and wiring out of the work area and the solenoid and control unit removed, I could finally get to the fuel pump with fuel filter.
Once back together, I started up the generator, ran it for about 10 minutes without a load, then another 30 minutes with the a/c running and I am happy to say that all is well.
There are a few different fuel pump designs for sale. I recommend one that looks like the original design as shown.
Because of the price and "supposed quality", I bought one that was styled like this.
It requires this elbow purchased separately.
It worked fine, but required filing the screw-mounting hole a tad bit more elongated to address a gentile interference problem. The original design has no interference.