The short answer
A water pump replacement is one of the least expensive outboard repairs — when it is done on time. The parts are modest: an impeller, a gasket or seal kit, sometimes a housing and wear plate if the pump ran dry or ingested sand. Most of the quote is labor: dropping the lower unit, rebuilding the pump, and pressure-testing the cooling system afterward.
What makes the job expensive is delay. A worn impeller that still gives you a weak telltale is a pump job. A worn impeller that ran the engine hot for a season is an overheated powerhead — and that is not a pump job anymore. Common repair and diagnostic labor is $149 per hour, and we quote parts and any additional work in a written estimate before anything is touched.
What actually drives the price
- Engine size and brand. A 15 hp tiller and a 350 hp Verado use very different pumps. Larger and newer outboards can need more disassembly — exhaust covers, shift linkage, or a power-assist unit in the way of the lower unit drop.
- Parts scope. If the housing, wear plate, or cup seal are scored, the kit alone is not enough. We will show you what we found before replacing beyond the impeller.
- Collateral damage. Sand grinding through the pump can score the drive shaft. A seized impeller can shear off and block the pickup tube. Every one of these turns a one-hour job into a longer one.
- How the boat is kept. A boat on a trailer or a dock is a straightforward visit. Boats stored in racks or behind other boats at a marina add haul-out time to the visit.
Six signs your water pump is on its way out
- The telltale stream is weak, sputtering, or missing at idle.
- The stream runs clear but the alarm sounds after 10–15 minutes of running.
- You had a sandbar day — the motor sat in sand or weed while idling.
- The engine pees fine at speed but the stream dies when you idle.
- It has been more than three seasons (or about 300 hours) since the last pump.
- You bought the boat used and nobody can tell you when it was last serviced.
Any one of these is a good reason to book a water pump and impeller service before your next run, not after.
Why waiting makes it cost more
The pump is cheap insurance on a very expensive engine. Once cooling fails, an outboard can cook a piston or warp a head in minutes, and a powerhead replacement costs more than most boats' owners want to think about. Around here the risk is higher than average: between the sandbars of the Intracoastal and the shallow flats off Jupiter, ingesting sand and shredded impellers is one of the most common things we see on service calls.
A good rule of thumb: service the pump every two to three years in salt water, and immediately after any run-dry or sand incident — even if the engine "seemed fine." The damage is inside the pump, not on the gauge.
Getting a straight quote
When you request a quote, tell us the engine make, model, year and horsepower, the symptoms you have seen, and where the boat sits. We come to your dock, lift, or marina anywhere in our Palm Beach County service area, and most water pump jobs are finished the same visit. Request a quote online or book a service call and we will give you a written estimate before any work begins.