Pressure Washer: Weak spray

An insufficient water supply can cause low pressure at the nozzle. Check the water pressure at the source and the flow connected to the inlet of the pressure washer. Check the inlet screen for a clog that could be blocking the water flow. Check whether a low-pressure spray tip is installed on the wand; if so, install a different nozzle. A problem with the wand can also cause low nozzle pressure. Clean or replace the wand if necessary. A pump failure can cause low nozzle pressure. Rebuild or replace the pump if it doesn’t build up adequate spray pressure. A stuck unloader valve can also cause low pressure at the nozzle. Replace the unloader valve if it doesn’t operate properly.

These repairs may help solve your Pressure Washer problem:

Replace the pressure washer pump check valves

Check valve kit

The check valves are spring-actuated pump valves that allow water to flow in one direction from the pump inlet to the pump outlet. If the check valves are worn out or defective, the pressure washer won't spray. Inspect the pump check valves and replace them if worn or defective.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the pressure washer pump

Pump

The pump creates the water pressure when the engine is running. If the pump isn’t developing any water pressure, replace the pump assembly.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the pressure washer unloader valve

Unloader valve

The unloader valve reduces water pressure within the pressure washer pump when the pump runs but the spray wand isn't used, by recirculating water to the pump inlet. If the valve sticks in the closed position, the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can't open to allow recirculation. If the pressure washer doesn't develop adequate outlet pressure, the unloader valve could be stuck open. Replace the unloader valve if it sticks in either the closed or open position.

For manuals, repair guides, and specific part recommendations, enter your model number.

Replace the pressure washer pressure hose

Pressure hose

If the water pressure hose leaks at the fittings, check each fitting for proper tightness. If you can’t tighten the fittings, replace the pressure washer hose. Also replace the hose if it is split or damaged.

For manuals, repair guides, and specific part recommendations, enter your model number.