Linwood,Welcome to the forum!
That is a hose made for gasoline and is easy to replace if you can get to the clamps! If you can see the clamp on the tank end loosen it and remove that end do the same thing in the other end NAPA carries replacement hoses you need to measure the size as there are different sizes, I f you can't remove the clamp on the upper end remove the filler neck from the side of the coach, But you should be able to do it one way or the other, Not really a big job. Just make sure the gas level is below the clamp on the tank so as not to spill any.
Hope this helps you.
Earl