Symptoms
- Spray is weak or dribbles instead of a strong jet
- Pressure fluctuates while spraying
- Engine or motor runs fine but output is weak
- Pressure was fine last use and dropped suddenly
Likely causes
- CommonClogged or worn spray nozzleDebris in the tip or nozzle wear reduces pressure and spray pattern.
- CommonAir trapped in the systemAir pockets after a hose change or new pump cause pulsing, weak spray.
- PossibleWorn unloader valveThis valve regulates pressure and can wear or stick over time.
- PossibleKinked or damaged high-pressure hoseA kink or internal damage restricts flow.
- PossibleInsufficient water supplyA partially closed spigot or garden hose that's too thin starves the pump.
What to do
- Make sure the water supply hose is fully open and not kinked, and that it's at least 5/8 inch diameter.
- Turn off the machine and clean the spray nozzle tip with the cleaning pin that often comes with the unit.
- Purge air by running the washer without the nozzle attached until water flows steadily.
- Inspect the high-pressure hose for kinks, cracks, or bulges.
- Check the inlet water filter screen for debris and clean it.
- Try a different nozzle tip to rule out a worn or damaged one.
- If pressure stays low, the unloader valve or pump may need professional service.
Tools and parts
- Nozzle cleaning pin
- Garden hose
Pressure washer nozzle tip setSearch: “pressure washer nozzle tips replacement”
Pressure washer hoseSearch: “pressure washer high pressure hose replacement”
When to call a pro
If cleaning the nozzle and hose doesn't restore pressure, a pressure washer repair shop can test and replace the unloader valve or pump.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.