Tommy B. Howdy;
Glad to see you are getting it figured out. Now then, ... when you said;
Tommy B wrote:need to install water pump on/off switch pronto. have to pull fuse to turn off.
this would make it very easy to release water pressure. of course. so it goes.

were you meaning that the pump was running the whole time??? If so that would indicate a leak
somewhere in the system. Generally the pumps cycle when there is a demand for water and shut
off when the demand stops, the sign of a well schooled pump ...
To release water system pressure you need to open a valve somewhere (or have something like the
vacuum breaker), in there ... like taking your finger off the end of a straw filled liquid. I don't know
how your water heater's plumbing is set-up but if there is a check-valve where the water enters the
heater then the vacuum breaker will only drain the hose when pressure is off (zero demand), so you
would need to open a tap (like in the kitchen), to relieve any pressure in the water system after you
turn the pump off. Most pumps have a check valve at the output side to prevent back-flow. That's how
you get that instantaneous gush of water when you open the tap.
hank
Striving for a less complicated life since 1949 ...
Every day I beat my own previous record for number of consecutive days I've stayed alive.