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Old 12-09-2023, 04:03 PM   #1
4 Rivet Member
2019 28' Flying Cloud
Dripping Springs , Texas
Join Date: Dec 2019
Posts: 328
HOWTO: Upgrade 2019 FC 28RBT pump

We've always had weak water delivery as told here:

After I got the initial issue debugged (air leak at intake) the pump was still noisy and seemed to have a backflow leak so I decided to upgrade and also add an accumulator.

IRVWPC pump controller ($200 - this is what makes things quiet)

New 4008 series pump
(kept the old as a spare - FWIW this is the OEM unit)

Accumulator (smoothes water flow even more)

Quiet Kit:

High Level steps:
- Remove paneling to access pump
- Disconnect old pump (electrical, pipes)
- Unscrew the rubber feet from the floor
- Place new pump, connect inlet hose
- Connect IRVWPC water sensor to outlet
- Connect Accmulator to water sensor
- Connect Accumulator outlet to AS plumbing
- Screw in rubber feet of pump, Accmulator
- Double check all fittings
- Connect electrical, prime the system
- Connect IRVWPC sensor - done!

Install notes:
- Did not cut any PEX pipes or electrical wires, everything was done with NPT fittings and their included rubber gaskets.
- Be prepared to visit HD to purchase the replacement rubber gasket for the inlet/outlet pipes removed from the old pump. (I would not reuse when going through an overhaul although they didn't appear damaged)
- Also purchased a street elbow, this one will require either pipe cement or tape which I already had
- Some water dribbles out at disassembly, have a towel nearby
- I used one of the 'quiet kit' hoses to connect the new pump inlet but didn't use the other one since they're very long.
- Instead I purchased another 1/2" diameter 'Lavatory hose' to connect the Accumulator, this allows it to sit near the pump in a natural position with the air valve easily accessible
- After connecting everything loosely I screwed down the pump & accumulator. This is by far the most difficult step since there is little space to work. I let all components align themselves naturally rather than forcing them to be in any particular direction. Both still very easy to access should I need to.
- Then I tightened the pipe fittings, making sure they're in a natural position with no kinks.
- Connected electrical: Controller RED & BLACK to Pump RED & BLACK; Controller YELLOW to AS +12V; Controller WHITE to AS WHITE
- Turn on power, Primed the system, then turn off power
- Connect Controller sensor, restore power, all done
- I left most Controller DIP switches at the factory settings, only change was to switch #6 to 'ON' (emergency shutoff)

The system is now amazingly quiet!
Just as expected we can 'drizzle' water from the faucet without issue or let it run full blast. One can hardly notice the pump. Looking forward to our next boondocking trip

The pump is located under the stove on the 2019 28RBT

Open the hatch and remove the thin plywood panel

Remove the old pump

Note: These little seals will fall out! Turns out they're "cone gaskets".

Where to get replacement 'cone gaskets'?

- Home depot carries these PEX fittings and you may harvest the gaskets (discard the fittings)

Old pump removed:

To create space I attached the AC hose to the cabinet with a DIY 'sling':

The accumulator with hoses attached, plus the water sensor

The pump controller already came with one steel braided hose.
I purchased another from HD for the outlet side:

1/2" Street Elbow from HD for the final connection

Everything buttoned up!
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Old 12-09-2023, 09:19 PM   #2
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2009 25' FB International
2018 27' Globetrotter
Tavares , Florida
Join Date: Mar 2014
Posts: 3,619
Well planned and executed project. And thanks so much for taking the time to share all the details and pictures. I'm sure they will be very helpful for anyone who wants to do the same thing.

I also installed the IRVWPC controller and it is a great product and certainly helps reduce the pump noise.

Thanks again!
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Old 12-10-2023, 02:32 PM   #3
4 Rivet Member
2019 28' Flying Cloud
Dripping Springs , Texas
Join Date: Dec 2019
Posts: 328
FWIW I left the Controller set at 30PSI 'pressure set point' (the default) and pumped up the Accmulator to 30PSI per recommendation in the install sheet.
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