I think everyone's thoughts on pressure are right. I tried the system with just water pump pressure and the pressure relief valve seemed to hold. I read in the Aqua-Go literature that 65 psi was the high limit.
Odd that my 65 psi pressure reducer worked just fine in January. It's advertised for 65 psi, but it is also 4 years old. Seems like I read somewhere that they do wear out & won't hold pressure accurately after a few years.
So, I ordered a Camco pressure reducer that says it regulates 40-50 psi. It arrives tomorrow & then we're off for a week in the Smokies
One aside: I talked to a Truma tech & he told me they were dropping the Watts regulator and going with a European brand that can be changed out.
Thanks for everyone's ideas, see ya'll at Anchor Down!
Happy camping.
Dave