If it's a 4 kW 4KY generator, you should be able to get to the fuel pump by removing the starter solenoid, control module, etc. via the access panel on the generator without removing it from the RV. It's underneath all the other bits and pieces on the left side of the big baffle/bulkhead about midway across the access panel.
If it's a different model, I can't offer any specific help.