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Fix a pressure washer that will not spray

We'll check the water supply, clear the nozzle, prime the pump, and inspect the unloader—or tell you when to call a pro.

Troubleshooting · Home appliances
15–30 min
What you'll need
  • Clean water (for nozzle soak)
  • Replacement nozzle or unloader (if faulty)
Step 1 of 10

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Steps

Goal: Confirm the symptom, check the water supply, clear the nozzle, prime the pump, then inspect the unloader.

  • Start the pressure washer. If the engine or motor runs but no water comes from the wand, the water delivery system has failed.
  • Good: The engine runs but does not spray. Proceed to Check water supply and nozzle.
  • Bad: The engine does not run—different problem. See When to get help.

Check water supply and nozzle

Goal: Confirm water reaches the pump and the nozzle is clear.

  • Confirm the garden faucet is fully on. Check the hose from the faucet to the pressure washer—no kinks, tight connections. Disconnect the inlet hose at the washer—you should see a steady stream.
  • Remove the spray tip or nozzle. Soak it in warm water to dissolve mineral buildup. Use a pin to clear the orifice. Rinse and reinstall.
  • Check the inlet filter at the water inlet. Clean or replace if clogged.
  • Good: Water supply is good and the nozzle is clear. Proceed to Prime pump and unloader.
  • Bad: No water supply—fix the faucet and hose first.

Prime pump and unloader

Goal: Prime the pump and confirm the unloader allows flow to the wand.

  • With the water supply on, pull the trigger and run the pump until water flows from the wand. Release the trigger and let pressure build.
  • Inspect the unloader valve. It diverts water when the trigger is released. If it sticks open, water bypasses the wand. Check the owner’s manual for location. Clean or replace if stuck.
  • Good: Pump is primed and the unloader works. The pressure washer should spray.
  • Bad: Pump will not prime or unloader is faulty—call a pro.

When to get help

Call a pressure washer technician if:

  • The pump will not prime after clearing the inlet and filter.
  • The unloader valve is faulty and you cannot replace it.
  • The pump is leaking or damaged.

Verification

  • Water sprays strongly from the wand when you pull the trigger.
  • Pressure builds and holds when the trigger is released.
  • No leaks at the hose or pump connections.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Confirm symptom Verify the engine runs but no spray; rule out a different problem.
  2. Water supply Check faucet, hose, and inlet filter.
  3. Nozzle Clear or replace the nozzle.
  4. Pump prime and unloader Prime the pump and inspect the unloader valve.
  5. Call a pro Pump will not prime or unloader faulty—call a technician.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Pressure washer type (electric or gas)
  • Whether the water supply was on
  • Whether the nozzle was clogged
  • Whether the pump was primed
  • Unloader valve condition
  • Steps already tried

Does the engine run but no water spray?

Start the pressure washer. If the engine runs but nothing sprays, the water delivery system has failed.

Start the pressure washer. Good: engine runs but no spray—delivery fault. Bad: engine does not run—different problem (fuel, spark); see fix-pressure-washer-will-not-start or similar.

Yes No

You can change your answer later.

Is the water supply on and flowing?

The faucet must be on, the hose connected, and the inlet clear.

Confirm the faucet is fully on. Check the hose for kinks. Confirm the inlet screen is clear. Disconnect the inlet hose at the washer—you should see a steady stream. Good: water flowing. Bad: no flow—fix the supply.

Yes No

You can change your answer later.

Fix water supply and retest

Turn on the faucet. Straighten the hose. Clean the inlet screen. Reconnect and test.

Done

Is the nozzle clear?

A clogged nozzle blocks spray. Remove and clean or replace.

Remove the spray tip. Soak in warm water. Clear the orifice with a pin. Reinstall. Good: nozzle clear. Bad: still clogged—replace the tip.

Yes No

You can change your answer later.

Clear nozzle and retest

Clean or replace the nozzle. Reinstall and test. If it still does not spray, proceed to prime the pump.

Done

Is the pump primed?

An unprimed pump runs but moves no water. Prime by pulling the trigger until water flows.

With water on, pull the trigger and run until water flows. Release and let pressure build. Check the inlet filter if it will not prime. Good: pump primed, water flows. Bad: will not prime—check filter, call a pro.

Yes No

You can change your answer later.

Prime pump and retest

Prime the pump per the owner's manual. Clean the inlet filter. If it still will not prime, call a pro.

Done

Is the unloader valve working?

A stuck unloader diverts water away from the wand.

Inspect the unloader valve. Clean or replace if stuck. Good: unloader allows flow to wand. Bad: unloader faulty—replace or call a pro.

Yes No

You can change your answer later.

Pressure washer should spray

Pull the trigger. You should see a strong spray. Adjust the nozzle or pressure as needed.

Done

Call a technician

Call a pressure washer technician if the pump will not prime, the unloader is faulty, or the pump is leaking or damaged.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a pressure washer not spray?
Common causes: no water supply (faucet off, kinked hose), a clogged nozzle, an unprimed pump, or a faulty unloader valve. Check water supply first, then nozzle, pump, and unloader.
Can I fix a pressure washer that will not spray myself?
Yes. Most units need a good water supply, a cleared nozzle, and a primed pump. Unloader valve replacement may need a pro if you are not comfortable with pump disassembly.
When should I call a technician for a pressure washer?
If the pump will not prime, the unloader valve is faulty and you cannot replace it, or the pump is leaking or damaged.

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