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Hi my name is Robert
What is the Year, Make and Model of the RV? What is the make and model of the generator? The more info you can provide the better we can assist you... Robert
This could be a few things, it could be the fuel filter, fuel pump, or the line going from the supply to the tank. To start I would check the line that is going to the fuel tank, many times they will use a rubber line and if that line has any cracks or loose connections the generator can suck air into the lines and might not start. You could get a gas can and run the supply direct to see if that is the problem. Next IF you have not done so I would change the fuel filter. Then you are possibly looking at the fuel pump or carb. as the issue.... Hope this helps some... Robert