Verify you have more than 1/4 tank of fuel....most fuel pickups are setup so the generator cannot use fuel below 1/4 tank and potentially leave you stranded.
From the service manual here are some other simple things you could test for:
A. Vapor lock may occur in high ambient temperatures: operate in ambients at less than 120°F; verify
proper installation to prevent air recirculation; correct as necessary.
B. Verify steady DC voltage at fuel pump while genset is running; repair wiring as necessary.
C. Run genset on shop fuel supply; verify tank level and fuel line condition in vehicle.
D. Verify carburetor altitude setting; readjust as necessary.
E. Verify choke operation, setting and linkage damage; readjust, repair or replace as necessary.
F. Measure throttle stop frequency; readjust as necessary.
G. Measure fuel pump pressure/flow: replace fuel filter or pump as necessary.
Below is the entire code 41 troubleshooting section: