When using the washer does it hurt the pump if I leave it running without depressing the trigger?
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For a minute or two, no. It's designed to recirculate the pumped water back into the inlet when the unloader activates (which is what happens when you release the trigger). Keep in mind though, if you allow it to keep running, the recirculated water gets hot from the friction. This can cause problems in the pump, or the temperature-sensitive relief valve will dump the hot water. In either case, the pressure washer would be temporarily out of service until the pump was repaired, or the relief valve was reset.
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