Most common cause of this, in a RV, is a clogged aerator.
Construction debris often gets trapped there. Unscrew the aerator and clean.
There's only one water pump.
Dan-Retired California Firefighter/EMT
and Zoe the Wonder Dog(R.I.P.)
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity