When I installed my camera for my backup monitor I actuated it with power from the backup light circuit with a .5 amp resistor in line. I also ran a 12v feed down stream from the resistor, with a switch that I can power the camera at any time. It doe...
Somewhere in threads a couple years ago part numbers for the 8.1 workhorse rv water pump were listed. I checked at the time and Rock Auto Had the correct number pump available. Much cheaper than Workhorse Prices.
The sad thing about computerized vehicles the computer can make adjustments to keep the vehicle seemingly running correctly. Fuel mileage is a way to track problems that you cant feel in performance but doesn't tell you the problem.
The Onans used to be 3 years, I would check again. I had a similar problem with my 2003 Fleetwood Storm when it was about 2 years old. Cummins fixed under warranty.