How do I tell if my pressure washer pump is bad?

Author: Kenya Block  |  Last update: Wednesday, July 23, 2025

Recognizing these five warning signs of a failing pressure washer pump can help you avoid costly downtime and prolong the life of your equipment:
  1. You experience a decrease in pressure or none at all. ...
  2. You hear unusual noises. ...
  3. You see leaks or drips. ...
  4. The pump cycles on and off often. ...
  5. Your pressure washer is old.

How do you know if a pressure washer pump is bad?

Definitive Pump Testing
  • Attach a pressure gauge to the outlet of the pump to measure the pressure directly.
  • Start the pressure washer and observe the gauge.
  • If the pressure spikes and then drops to a trickle, it confirms an internal pump issue.

Is it worth replacing a pump on a pressure washer?

Have you gotten many years and hours of use from the pump? If so, it may be time to replace it. However, if it is a newer pump, repair might be best. A good rule of thumb is if the repair costs more than 50% the value of a replacement pump, it is likely time to replace it.

How do I know if my washer needs a new pump?

The pump impeller shouldn't turn both directions freely. It should have a rubber bandy type feeling going one direction due to the magnets. Either way, the pump only needs to be replaced if the washer isn't draining, or if it's really noisy.

How do I know if my pressure pump is bad?

A change in sound can alert you to an issue with your pump or system. If you hear popping sounds, especially near the impeller, you could be experiencing cavitation. This occurs when there are pressure changes within a liquid, causing tiny pockets of air to form and then implode.

How to tell if your pump is bad on your pressure washer. (Pressure Gauge)

How do you check a pressure pump?

You can measure the head pressure by installing a pressure gauge or manometer and comparing this with the manufacturer's documentation for the diameter of piping in the system. If this is lower than advertised then the pump is not performing correctly and may need to be repaired or replaced.

Can you repair a pressure washer pump?

Can a pump on a pressure washer be fixed? In most cases, a pressure washer pump can be fixed instead of having to buy a new one. Common issues that may arise with a pressure washer pump include worn-out seals, damaged valves, or clogged inlet screens.

What causes the pump to go bad on a pressure washer?

A pump head needs smooth internal surfaces to seal properly. If you have head wash out or metal wear, it's typically not good. Also, scoring or lines internally on the brass head is an issue that will not re-seal.

How long does a pump last on a pressure washer?

Axial cam pumps are a step above wobble pumps. They generally last around 500 to 800 hours and are used in pressure washers under 3,500 PSI. Axial cam pumps are efficient and lightweight. However, they have a tendency to overheat when used for long periods of time.

How much does it cost to replace a washer pump?

Auto Windscreen washer pump: how much does this product cost? The price of car parts within the auto Windscreen washer pump category ranges from £2 to £109, depending on the vehicle type, manufacturer, and product specifications.

How much does it cost to repair a pressure washer pump?

Pump Repairs: Seals, Valves, and Unloader Valves

Replacing seals or O-rings might only set you back $20 to $50, but if the pump's valves or unloader valves are damaged, repairs can quickly escalate to $100 to $200. A complete pump replacement is even more costly, often ranging between $200 to $500.

What is the average life of a pressure washer?

If you are a homeowner, you will probably use a pressure washer for less than 50 hours per year. In this case, getting a machine rated for 500 hours will last you up to 10 years if properly maintained.

What is the life expectancy of a pressure pump?

Pumping systems often have a lifespan of 15 to 20 years.

What is the most common cause of a pressure washer going faulty?

The number one cause of low or no pressure when using a pressure washer is a blocked or worn nozzle. Blocked nozzles will prevent water from escaping, while a worn nozzle will allow too much water to pass through, causing the pressure to drop.

How do I check if my water pump is failing?

Symptoms of a Failing Water Pump in Your Car
  1. Leaking coolant. One of the most common signs that your water pump is starting to fail is leaking coolant. ...
  2. Overheating engine. Another common symptom of a failing water pump is an overheating engine. ...
  3. Coolant leaks into the oil. ...
  4. Engine noise.

Can I put a better pump on my pressure washer?

You'll have to match your old pump's pressure rating (PSI) and gallons per minute (GPM) with those of an available replacement. Remember, more is not always better-getting a new pump that puts out a lot more PSI can either bog down the engine, or be too powerful for your hose's burst rating.

How do I know if my pressure washer pump is bad?

Recognizing these five warning signs of a failing pressure washer pump can help you avoid costly downtime and prolong the life of your equipment:
  1. You experience a decrease in pressure or none at all. ...
  2. You hear unusual noises. ...
  3. You see leaks or drips. ...
  4. The pump cycles on and off often. ...
  5. Your pressure washer is old.

Is it OK to leave a pressure washer running?

And never leave your pressure washer unattended while running. If you have to walk away for more than a minute, turn the pressure washer off. It's not good for your pump to leave it running while not in use, and shutting it off can prevent unwanted accidents.

How do I know if my washer fluid pump is bad?

If you activate the windshield washer and don't hear the pump's distinct sound, then the pump is either broken or not receiving any power. This can be due to faulty wiring or other electrical issues.

Why is my pressure washer running but not pumping?

If the washer is running smoothly but there's no pressure or water coming from the pump, it could be a clogged wand, hose or inlet filter. If there's a chattering noise, that means air is leaking in the inlet fitting or suction hose.

What happens when the high pressure pump fails?

Symptoms of a high-pressure fuel pump failure are: Delayed start of the engine. Hesitation or sputtering in acceleration between 2000 RPM to 4000 RPM. High engine temperatures.

What is the life expectancy of a pressure washer pump?

It depends on the pressure washing equipment you purchase. New pressure washers will be rated with a number of hours they should last. For example, if it is rated 500 hours and you use it fewer than 50 hours throughout the year then it will last you more than ten years as long as you keep it well maintained.

What kind of oil do you put in a pressure washer pump?

SAE 30 for break-in: Pressure washers are shipped with SAE 30 oil, which is ideal for the initial break-in period. It's important to use this oil as it helps properly seat the engine's internal components. First 5 hours of operation: Do not switch to a synthetic oil until the first 5 hours of operation have been met.

How do I know if my washing machine pump is bad?

Disruptive noises: When your washing machine makes loud, thumping sounds during the drainage phase, it might indicate that the pump has a clog or can't effectively empty the water. No washer movement: Washing machines spin and jerk quickly to loosen dirt on fabrics.

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