You are going to need two persons, one under the fuel tank to listen for the pump, insert key and turn ignition on do not cranck engine, just the dash lights for two seconds and let the person under the RV that you are going to turn the ignition on, repeat several times.
When the key is turned to ignition the there is a two second period when the fuel pump is energised and if there is no start the rellay turns off, there should be a bussing sound from the pump or whirring, if no sound pump is gone, and needs replacement, also check that rodents have not chewed any wiring.
Might have to tow to the mechanic, to replace the pump you need to drop the tank.
navegator
