One problem related to other fuel system tank assembly has been reported for the 2014 Ford E-450. The most recently reported issues are listed below.
The contact owns a 2014 Ford E-450. While driving 55 mph, a loud hissing sound was heard from the front passenger side of the motorhome and an odor of fuel was noticed. The failure recurred intermittently. The motorhome was taken to a dealer where it was diagnosed that the pressure release valve for the propane tank failed and needed to be replaced. The motorhome was repaired, but the remedy failed. The manufacturer was made aware of the failure. The failure mileage was 2,000.