How to service a generator located under the rear of an RV

I had a 2002 Roadtrek 170 and had the same issues you are having. I ended up dropping the generator. My fuel filter was in the back left corner. I replaced it and the carburetor along with cleaning out a rats nest under the cooling shroud. When I put it back in it fired up on the first crank and handled the A/C and microwave without even a stutter.