Steve,
it sounds like it is time to either disassemble and clean your pressure relief valve or replace it.
The relief valve / pop off valve leaking would cause a drop in pressure at the nozzle, however a leak at the pump head also would create low psi at nozzle.
If the water is leaking from underneath the head it is probably worn packing.
I am available to help troubleshoot by phone feel free to call me. |