I just spent the better part of the afternoon replacing my pressure regulator at the water inlet. We have had very low pressure from the curbside hookup and I was sure that the culprit was the regulator. We had been using the on-board pump to boost the pressure - simultaneously drawing from the tank. Once the job was completed I began to examine the suspect regulator and found that the intake screen was jammed with trash - obviously the cause of the low pressure! I'm reporting this, with egg on my face, in the hopes of saving someone else the pita of changing the regulator - and the $39.50 cost of a new one.
2003 GMC 3500 D/A, CC, LB, 4x4 and 2000 Airstream Excella 30. WBCCI 7074