I am sure the time in the trailer last summer in Phoenix, while we were in Alaska, aggravated the situation.  The carburetor has been a nagging problem for several years.  I found the bowl gasket on the lower carb installed incorrectly.  The initial problem started in Michigan with an authorized dealer repair.  It is really difficult to install and requires an installation by feel with a check using a mirror.  It was kinked the last time it was installed.

The water pump is one of those things that just keeps getting worse over time. Apparently 21 years is beyond the expected service life.  Two years ago it was weak  pumping at an idle. After the “Arizona bake” it was inadequate at a fast idle and even at medium running speed.  When removed, the elastomeric pump paddles were no longer flexible.  Other than the effort required to push the impeller into the housing without a vise, it should have been an easy repair.  Except you must simultaneously reassemble lower unit onto the driveshaft, water pump tube, gear shifting mechanism and the bolts holding the lower unit to the engine.  It took a couple of tries to get it together then some time to reassemble the corroded trim tab/anode removed to get at one of the assembly bolts.