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Originally Posted by Rob Culver
Once you made the adjustment, did it eliminate the pulsing from other faucets ... even when there was low water flow?
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Originally Posted by Idaho Adventurer
It will still pulse some if a faucet is only opened up a little.
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Hmm. Pulsing at low water flow is an indication that the pump's TURN-ON and SHUTOFF pressures are set too close together.
For illustration, if the SHUTOFF pressure is set to 50 PSI, and the TURN-ON pressure is set to 48 PSI, the pump will run the system pressure up to 50 PSI and then shut off. Then, if you crack open a faucet at low flow, the pump will start almost immediately because you don't have to use much water to drop the system pressure from 50 to 48 PSI. And then it will turn off almost immediately because it has to rise only from 48 to 50. This is pulsing.
On the other hand, if the SHUTOFF pressure is set 50 PSI, and the TURN-ON pressure is set to 20 PSI, and you open a faucet at low flow, it will take a while for the system pressure to drop all the way from 50 to 20 PSI. When it eventually does reach 20, the pump will start, and will run for a long time because it has raise the pressure all the way back to 50. This is normal operation, not pulsing.
Of course, if you set the TURN-ON pressure way too low, like 5 PSI, the system will still work, but flow at the end will be a dribble.
On most RV water pumps, the SHUT-OFF pressure is adjustable, and you would raise the pressure to increase the spread and minimize pulsing. On some pumps, the TURN-ON pressure is factory-set and not adjustable, and on others, the spread between TURN-ON and SHUTOFF is adjustable. I've had both. But in the absence of leaks, pulsing at low flow is almost always an indication of TURN-ON and SHUT-OFF settings too close together.
Bill