Livewell Or Washdown Pump Not Working? Repair At Your Dock

Livewell Or Washdown Pump
Weak, Humming Or Dead?

A livewell pump that hums with no water, or trickles when it used to roar, is usually not a dead pump. It is air in the line, grass in the intake, an impeller with worn blades, or voltage that never quite gets there. Here is what it usually is, what you can check safely, and when to call.

What It Usually Is

Runs but no water: an airlock. A hose with a high spot, or a pump mounted above the waterline, traps air and the pump spins dry. Re-routing the hose or repositioning the pump fixes it for good; priming it fixes it for the day.

Weak flow: the intake strainer or the seacock is clogged with grass and weed, the impeller blades are worn or bowed, or the spray head in the well is blocked. The pump sounds fine and moves half the water.

Hums or will not start: low voltage at the pump from a corroded connection or a tired battery, a blown fuse, a bad switch, or a motor that ran dry too long and burned.

Fish dying with the pump running: flow, not the pump. Too little water exchange, a recirculating valve left in the wrong position, or an intake that is only below the waterline at rest and sucks air underway.

Five-Minute Checks You Can Do Safely

Seacock open — the lever in line with the hose; it is the first thing to check and the most common thing to forget

Intake strainer — from the dock or the lift, look for grass and weed on the through-hull screen and clear it

Hose run — follow it from the pump to the well; a loop that rises and falls traps air, a kink stops it dead

Spray head — unscrew the nozzle in the well and look for grass and scale

Fuse and switch — find the pump's fuse; try the switch with the engine running, when voltage is higher

Listen — a pump that hums without the sound of water moving is airlocked or jammed; do not leave it running

Do not leave a seacock open and the boat unattended with a hose you are not sure of, and do not run the pump dry while you troubleshoot. Open through-hulls sink boats; dry running cooks impellers.

When To Stop And Call

If the seacock will not move, the through-hull is weeping, or water appears in the bilge when the pump runs, stop there. A seized seacock and a weeping through-hull are below-the-waterline fittings; forcing one at the dock is how a boat ends up on the bottom. Water in the bilge when the pump runs is a split hose or a failed fitting on the pressure side.

Livewell, Baitwell And Washdown Pump Repair At Your Dock

We read voltage at the pump while it runs, test the fuse and switch, confirm the seacock and intake are clear, trace the hose for high spots and kinks, then pull the cartridge and inspect the impeller. Pump cartridges, impellers, strainers, hose and switches are replaced at the dock, seacocks are serviced or replaced with the boat on the lift, and a pump that airlocks gets its plumbing corrected so it stops happening.

Regular hours (6am–4pm): a $250 diagnostic visit. We come to the boat, find the actual cause, and quote parts and labor before any work starts. After hours, Sundays and holidays: a $295 call-out. Parts, labor and sales tax always show as separate lines on the invoice, so you can see exactly what you paid for.

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Service guides: Yamaha oil change · Mercury & Verado oil change · Lower unit service · Fuel filters · The 100 / 300 / 500-hour service explained · Electrical & electronics problems.

Straight Answers

Why is my livewell pump running but not pumping?
Air in the line, or a blocked intake. The pump has to sit below the waterline with the hose rising from it; a high loop or a pump above the water traps air every time.

How do I prime a livewell pump?
Make sure the intake is below the waterline and the seacock is open, then crack the hose at the highest point until water flows, or re-route the hose so it does not need priming at all.

How often should the impeller be replaced?
When the blades show wear, bowing or missing tips, which on a hard-worked well pump in Florida is often every season. We check it whenever the pump is apart.

Can you fix it at the dock?
Yes for the pump, cartridge, hose, strainer, switch and wiring. The seacock and through-hull are done with the boat lifted.