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Trent Lane, East Bridgford, Nottinghamshire NG13 8PF
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Trent Lane, East Bridgford, Nottinghamshire NG13 8PF
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A working water pump is vital for your boat’s safety and smooth running. It helps move water through your systems – whether it’s for cooling, cleaning, or keeping the bilge dry. Like all marine parts, water pumps wear out over time. But how do you know when it’s time to replace one?
In this post, we’ll show you the warning signs of a failing pump, how often to check it, and what to expect during a replacement. Whether you’re a new boater or experienced on the water, keeping your pump in top shape is key.
Here are some signs and checks that might mean it’s time to replace your boat’s pump:
If you notice one or more of these, it may be time to fit a new marine pump.
Water pumps fail for a few reasons. Wear and tear is the most common, especially in older boats or those used often. Saltwater can also cause corrosion, and dirt in the system can block flow. In colder months, if a pump isn’t drained properly, freezing can damage seals or crack the body.
Most pumps aren’t built to last forever – especially if they’ve been running dry or under high strain.
Outboard water pumps (impellers) are inspected every year as part of the annual service. Some manufactures recommend replacement on a annual basis, where other manufactures recommend replacement ever three years.
We recommend checking your boat’s water pump before every season – and more often if you use your boat regularly.
Look for any signs of damage, check the wires and hoses, and make sure it starts properly. If you’re not confident doing this yourself, we’re happy to check it as part of a service.
A small check now could save you from costly repairs later on.
Some smaller bilge or freshwater pumps are fairly easy to change yourself, especially if they’re surface-mounted with quick-connect hoses. However, more complex pumps – like those built into cooling systems or involving electrical rewiring – are best left to a marine engineer.
At Lincolnshire Marine Services, we can replace or upgrade your pump safely and correctly.
Keeping an eye on your water pump helps prevent bigger problems later. A simple check at the start and end of each season can make all the difference.
Not all pumps are the same. Whether you’re using a bilge pump, pressure pump, or shower pump, understanding your setup helps you spot issues early.
Clean water in = clean pump out. Avoid dirt or debris getting into the system, especially in inlets and filters. This keeps your pump working longer.
Bilge Pumps have strainers on the inlet, these should be checked and cleaned on a regular basis. This is the biggest cause of bilge pump failure.
Fresh water pumps usually have a filter on the inlet side of the pump. These are often relatively inexpensive, and are worth replacing on an annual basis to prevent failure of the water pump.
If your pump is showing signs of age or wear, it’s better to replace it early – not when you’re stuck out on the water.
Most marine pumps last 3–5 years, depending on use and care. Saltwater, lack of maintenance, or poor installation can shorten that time.
Outboard impellers should not be left more than three years. Being made from rubber, they harden and deteriorate over time regardless of the hours used. Winterising your boat properly can help extend the life of your water pump — discover more in our off-season boat care guide.
You risk losing water flow when you need it most – for cooling, cleaning, or pumping out water. A failed pump can also damage other parts of your boat.
Yes. Bilge pumps are key to keeping water out of your boat. If they’re old, noisy, or slow to drain water, it’s time to replace them.
At Lincolnshire Marine Services, we stock and fit reliable water pumps for all types of boats. Whether it’s a bilge pump, freshwater pump or shower system – we’ve got the parts, tools, and know-how.
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