The 2 most common part(s) or condition(s) which cause the symptom Pressure washer leaks water are listed below starting with the most likely. Check or test each item and watch any available videos.
RepairClinic Item # 2309697
If the pressure washer leaks water the pump assembly may be worn out or need to be rebuilt. If the pump is more than a few years old and the pressure washer gets a lot of use, replace the pump. If the pump is on the newer side and not used very often rebuild it or replace the seals.
RepairClinic Item # 1955152
If the pressure washer leaks water it may be coming from the thermal release valve, this is normal. If the pressure washer is left running without any water spraying out of the nozzle, the water in the pump will heat up. Once this water reaches a certain temperature the thermal release valve opens to let the hot water out and cooler water in.