Step-by-step fix
Step 1: Make sure the trigger gun is really the problem
- Look over the trigger gun body and trigger area for cracks, heavy leaking, a trigger that will not move smoothly, or a trigger lock that no longer works.
- Check the hose connection and wand connection for obvious damage or stripped threads that could be causing the leak instead of the gun itself.
- If the washer runs but spray starts and stops only when you squeeze the trigger, or water leaks from the gun housing, the trigger gun is a likely failure point.
- Confirm you have a replacement gun that matches your hose connection, wand or lance connection, and general pressure washer setup before taking anything apart.
If it works: You have good reason to replace the trigger gun and a replacement that appears to fit your setup.
If it doesn’t: If the hose, wand, or fittings are damaged instead, replace the failed part first so you do not swap the gun unnecessarily.
Stop if:- The hose is bulging, split, or leaking near the crimped ends.
- The spray wand, lance, or threaded fittings are cracked or badly stripped.
- You cannot confirm the new trigger gun matches your connection style.
Step 2: Shut the washer down and relieve all pressure
- Turn the pressure washer off.
- Shut off the water supply feeding the machine.
- Squeeze the trigger on the old gun until water flow drops off and trapped pressure is released.
- Disconnect the spark plug wire on a gas unit, or unplug an electric unit, so the machine cannot start while you are working.
If it works: The system is off, disconnected from power, and no longer holding pressure in the gun and hose.
If it doesn’t: If the trigger will not release pressure, keep the machine off and water supply off, then loosen connections very slowly only after the hose has cooled and pressure has bled down as much as possible.
Stop if:- The hose stays rock hard and pressurized and you cannot safely relieve pressure.
- Any fitting begins hissing, spraying, or moving violently when you start to loosen it.
Step 3: Remove the old trigger gun
- Lay the hose and gun where you can work without twisting the hose sharply.
- Disconnect the spray wand or lance from the front of the trigger gun if it is separate.
- Loosen the hose connection at the rear of the trigger gun by hand or with an adjustable wrench if needed.
- Wipe the hose end and wand connection clean so grit does not get into the new gun.
If it works: The old trigger gun is off and the hose and wand ends are clean and ready for the new part.
If it doesn’t: If a fitting is stuck, apply steady pressure and support the mating part so you do not bend or crack it.
Stop if:- A fitting is seized badly enough that the hose or wand starts twisting with it.
- Threads are damaged enough that the new gun will not be able to seal properly.
Step 4: Install the new trigger gun
- Compare the old and new trigger guns side by side so the inlet and outlet connections are used correctly.
- If your setup uses threaded tapered fittings, apply thread seal tape neatly to the male threads only. Do not use tape on quick-connect style fittings unless the fitting design specifically calls for threads to be sealed.
- Attach the hose to the inlet side of the new trigger gun and tighten it snugly without overtightening.
- Attach the wand or lance to the outlet side of the new trigger gun and make sure any quick-connect parts lock fully into place.
- Check that the trigger moves freely and the trigger lock works before restoring water pressure.
If it works: The new trigger gun is installed squarely, the fittings are snug, and the trigger operates normally by hand.
If it doesn’t: If the connections do not thread on smoothly by hand first, back them off and realign them to avoid cross-threading.
Stop if:- The new gun does not accept your hose or wand connection style.
- Threads cross-thread or will not tighten securely.
- A quick-connect coupler will not lock fully.
Step 5: Pressurize the system and check for leaks
- Turn the water supply back on with the pressure washer still off.
- Let water fill the hose and gun for a moment, then inspect the rear and front connections for drips.
- Squeeze and release the trigger a few times with the machine still off to confirm water flows through the gun and the trigger returns cleanly.
- Tighten a leaking threaded connection slightly if needed and wipe it dry so you can recheck it.
If it works: Water flows through the new gun and the connections stay dry or nearly dry before the machine is started.
If it doesn’t: If a connection still drips, shut the water back off, relieve pressure again, and reseat that connection before moving on.
Stop if:- Water leaks from the body seam of the new trigger gun.
- A fitting will not seal even after being reseated and tightened correctly.
Step 6: Test the repair under normal use
- Restore power to the pressure washer and start it normally.
- Spray for a few minutes the way you normally use the machine, watching for leaks at the hose connection, gun body, and wand connection.
- Release the trigger and confirm the gun shuts off cleanly without sticking open or continuing to spray.
- Use the trigger several times in a row to make sure it feels smooth and consistent under pressure.
If it works: The pressure washer sprays normally, the trigger gun does not leak, and the trigger opens and shuts off cleanly during real use.
If it doesn’t: If the gun still leaks or behaves erratically, recheck fit, sealing surfaces, and connection type. If those are correct, the problem may also involve the hose, wand, or pump side of the system.
Stop if:- The new gun leaks from its housing during use.
- The trigger sticks open or will not shut water flow off reliably.
- The hose connection sprays water forcefully or begins to separate under pressure.
Replacement Parts
Repair Riot may earn a commission from qualifying purchases, at no extra cost to you.
FAQ
How do I know if the trigger gun is bad and not the hose?
If water leaks from the gun body, the trigger sticks, or the gun will not open and shut off cleanly, the gun is a strong suspect. If the leak is at the hose jacket, crimp, or a damaged threaded end, the hose is more likely the problem.
Do I need thread seal tape on the new trigger gun?
Only on threaded fittings that are designed to seal on the threads. Many pressure washer connections use quick-connect parts or sealing surfaces that do not need tape. If the old setup did not use tape and sealed at an O-ring or coupler, copy that arrangement.
Can I use any replacement trigger gun?
No. The replacement needs to match your hose connection, wand connection, and overall pressure washer setup. Compare the old and new connection styles before ordering and again before installation.
Why does the new trigger gun still drip after installation?
The most common causes are a mismatched fitting, dirty sealing surfaces, damaged threads, a missing or damaged seal, or a connection that is not fully seated. Shut the system down, relieve pressure, and inspect the leaking joint closely.
Is it safe to keep using a cracked trigger gun?
No. A cracked or leaking trigger gun can fail under pressure and should be replaced before further use.