Check the electric fuel pump that is located by the right rear tire. It gets the fuel to the mechanical fuel pump. rubber fuel lines might be a problem, but that would show up more when you are stepping on the gas than dying at idle. Mine acted the way you are describing but that was after a complete rebuild of the carb and no fine tuning was done when it was installed.
One FYI I always add Lucas fuel treatment to our MH, 1 cup for every 10 gallons of gas. It is expensive, but not having fuel problems makes it worth it to me.
