Water Pump won’t Shut Off @ 12.1V

[Filterman]

I have a Flojet 3526 water pump in a 2011 28RKS Wildcat that this season has decided it won’t shut off below 12.1 volts. Works perfectly on 110V either plugged in or from generator and works fine on fully charged batteries (13.5) but as soon as voltage drops ( which it frequently does when boondocking) it won’t build enough pressure to shut down. Does this mean it’s hatched or is there something I’m missing? Thanks in advance.
Floyd

[SeaDog]

What it means to me is that at the low voltage there is not enough amperage to allow the pump to build the pressure to trip the pressure switch. recharge your batteries sooner and you should eliminate the problem.

[dustman_stx]

Originally Posted by Filterman

I have a Flojet 3526 water pump in a 2011 28RKS Wildcat that this season has decided it won’t shut off below 12.1 volts. Works perfectly on 110V either plugged in or from generator and works fine on fully charged batteries (13.5) but as soon as voltage drops ( which it frequently does when boondocking) it won’t build enough pressure to shut down. Does this mean it’s hatched or is there something I’m missing? Thanks in advance.
Floyd

You can likely adjust your pressure to shut the pump off at a slightly lower setting as well.

[dustman_stx]

After looking at the manual it appears that model is not adjustable. Here is a link to the data sheet:

https://www.xylem.com/siteassets/bra...xautomatic.pdf

[Filterman]

Originally Posted by SeaDog

What it means to me is that at the low voltage there is not enough amperage to allow the pump to build the pressure to trip the pressure switch. recharge your batteries sooner and you should eliminate the problem.

Your analysis matches mine! However we’ve done 100s of nights of dry camping and this problem just started so I’m trying to figure out if it’s replacement time.

[Filterman]

Originally Posted by dustman_stx

You can likely adjust your pressure to shut the pump off at a slightly lower setting as well.

I actually looked at that but doesn’t seem to be adjustable ( per your next comment).

[pgandw]

Water pumps are generally cheaper than batteries...but a battery that is getting towards end of life will allow the voltage to sag more than when the battery was younger.

12.1 volts at rest is approximately 50% charge for an FLA battery.

just saying fixing one might not fix the other
Fred W