Replaced Original Fresh Water Pump! HUGE difference in noise and vibration

BOSCBIJI

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Aug 11, 2025
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Fluid Motion Model
Ranger Tugs Models
Howdy folks - just thought I'd share a successful equipment update.

Our FW pump has tended to sound like something in between a giant woodpecker and a jackhammer since we've owned the boat these last few months. After scanning the forum and researching options, we went with a pump swap out.

I installed the SEAFLO 42 Series pump today (Amazon $65). Install went great. I pulled the original pump out (noticed that the original pump was mounted on some open cell insulation that had been compressed to the point it wasn't doing anything).

Applied the sound deadening pads and then installed the SEAFLO. Other than having to clean up the water and work at an odd angle below my backside, was straightforward.

Results are astounding. When the pump runs we can JUST BARELY detect a motor sound. In fact, it's masked by the sound of the water running in the sink(s).

Hugely impressed, I was skeptical this would make that significant a difference, but its night and day.

Enjoy!
 
Howdy folks - just thought I'd share a successful equipment update.

Our FW pump has tended to sound like something in between a giant woodpecker and a jackhammer since we've owned the boat these last few months. After scanning the forum and researching options, we went with a pump swap out.

I installed the SEAFLO 42 Series pump today (Amazon $65). Install went great. I pulled the original pump out (noticed that the original pump was mounted on some open cell insulation that had been compressed to the point it wasn't doing anything).

Applied the sound deadening pads and then installed the SEAFLO. Other than having to clean up the water and work at an odd angle below my backside, was straightforward.

Results are astounding. When the pump runs we can JUST BARELY detect a motor sound. In fact, it's masked by the sound of the water running in the sink(s).

Hugely impressed, I was skeptical this would make that significant a difference, but its night and day.

Enjoy!

After 6 years, our factory OEM pump finally starting making loud noises when operating.

I just upgraded ours to the SeaFlo 43 last weekend.
 
I just replaced mine for the same reason with a Marco UP3/e. Not as quiet as the Seaflo but a massive improvement. Not so simple as I expected: my C26 pump is located under copilot stairs forward of fridge; pulled the fridge & installed a 4" inspection port as there's but 5" of access against the hull; still not enough room - wound up doing it from below (pull a monkey fur panel from port/forward cave). Hoses were 5/8 ID braid, Marco is fem threaded with 3/8 BSPP thread - pump came w/o hose barbs, only available direct 3/8 BSPP to barb is for 1/2" ID hose. Had to bridge 1/2 with a reducing union. Installed a pseudo-accumulator (2 yards of braided hose on the output). Installed a smart-things water detector below the pump & output tee (reports thru BRNKL), used the occasion to mount a Ruuvi directly against the potable tank (reports thru Cerbo GX). One thing leads to another... galley faucet has been leaking, replaced with similar (Ambassador Stasis) model, piece of cake. One more water detector - done. Had a worse time with a dead macerator: direct replacement showed up with a figure-eighted o-ring, assembler had attempted to tighten to spec neatly slicing the o-ring in 2 places and leaving the outer gasket loose. I didn't notice it until installed and leaking profusely. Wait for a fixit kit... rip it out & replace gasket & o-ring... reinstall. In the process discovered there's no filter in the vent (order/wait/installed Big Orange), the blackwater tank threaded/gasketed 3" lid is split (order/wait/install), and the vent barb is located at the top of the aft wall of the tank (daft, invites contamination of the vent line). One last step remains - seal off that barb and install a Vetus port/vent atop the tank.

/Diatom
 
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