Fuel hose leaking

You on my 2005 four winds the fill tube has a small plastic trap door valve at the bottom of the metal tube where it goes into the 1 1/4" rubber pipe and from there into a metal reducer pipe that then goes into another rubber tube over to the top of the gas tank. Maybe that trap door valve is faulty. Take that rubber hose off and see if it is working right. It snaps into the bottom of the metal down tube from the filler that is on the outside of the coach. It might be worth looking over. It sounds like you have a restriction that is pushing back....the other thing is the vapor valve on the tank could be faulty and it will also push back air which trips off the pump. If you hold the rubber back hard when pumping and you feel air rushing out and you can hear the gas starting to bubble up towards the pump handle then you do have a restriction that is not letting the air pressure regulate and it maybe that valve on the tank. That is what I thought I had when it was cold but it was just probable the cold freezing the valve since it works fine now.