[JRTJH]

OK, is there a difference between the "city water pressure/volume" and the "pump water pressure/volume" ???

If there is, are you using a water pressure regulator with your city water connection??? Most of us that do use an adjustable water regulator set it at 45-55 PSI. Also, the "tube type water volume restrictor" type is not a true regulator and won't protect your trailer system from excess pressure damage.

If not, the "issue" may not be a problem, it may be a significant difference in water pressure provided by the city water source (sometimes upwards of 100 PSI/3-5 GPM) and the onboard water pump (typically regulated at 35-45 PSI/2.5-3.5 GPM)...

From what I've read (quickly scanning back over the thread) you have "strong water pressure on city water and not as strong water pressure on the trailer pump"... Could this be a matter of "you get out what you put in," meaning the city water pressure is significantly higher and the RV pump just can't produce that much pressure/volume ???