We spent an entire summer with problems in our DP from FL to SD and home. We spent days in 3 different Cummins Coach Care facilities and 2 nights in a hotel. Thank goodness we were still under warranty as it would've been very expensive for the hours and hours of diagnostics. It showed we had a fuel problem, but they couldn't find the problem. Lo and behold, we had a dirt dauber nest in the vent line to the fuel tank. Once this was removed, our problems went away.It was very frustrating, to say the least.