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How to Diagnose Pressure Washer Pump Problems

Over time wear and tear can arise in your pressure washer this can lead to any matter of faults which we are going to help you diagnose and hopefully resolve the problem you’re facing.

In this article we are going to look at:

Each of these have their own ways of being identified and we have also gathered the best solutions to help restore your washer enabling you to continue to use your appliance.

Leaks are a very common problem with pressure washers most usually causes because of perished seals or faulty components.


When the leak is coming from the hose normally this would be because of the O-ring seal at the base of hose. A simple procedure, simply replace the old one with a new one.


There are three parts which sit inside your pressure washer which could be the cause of a leak:

These can become damaged simply by water which has not been drained out before the winter, the water can freeze and expand resulting in the plastic parts to become damaged.

How to Identify Internal Leaks

Remove the case of the pressure washer and then reapply the water hoses - you can then turn the water on but do not plug the machine in. The water pressure will then identify which area the leak is coming from.

If there is a leak in any area of the cylinder head the pressure which stops the machine from running when not in use will quickly disperse leading to the motor to restart or pulse, remember this can either be due to leaks or the seals.

Another cause resulting in your motor to pulse is water starvation, due to a blocked filter found on the inlet, simply remove it and clean out the blockage. This should be done if the washer is pulsing and not leaking.


Another problem which can commonly lead to fault within your pressure washer is low pressure - this can be due to faulty or perished O-ring seals inside the pistons, or the valve. You resolve the fault you will need to either replace the seal or if the seal is fine then you can clean out any dirt or debris causing a blockage.

There you have it! Some simple tips into diagnosing and resolving any faults you are having with your pressure washer. For more care and maintenance tips and how-tos don’t forget to check out our other articles in our advice centre.

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