Pressure Washer Shuts Off When Trigger Is Pulled – How to Fix

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Not many home cleaning machines come close to the pressure washer in cleaning efficiency and speed. Thus, it won’t come as a surprise to anyone that the pressure washer is ever-present in most homes. However, what happens whenever the pressure washer shuts off when trigger is pulled? Does it point to other underlying issues that might spell trouble for your washer?

If you own a pressure washer, this might be one of the issues you have faced or will face. So how do you solve this issue? You start by reading this write-up to the end.

Why Does Your Pressure Washer Shutoff When the Trigger is Released?

For many pressure washer owners, a puzzle is known when the pressure washer shuts off when the trigger is released. It is vital to appreciate the need for having all the facts before attempting to troubleshoot this problem.

Last update on 2021-09-16 / Affiliate links / Images from Amazon Product Advertising API

What exactly goes wrong before a pressure washer behaves in that manner? Several reasons would cause your pressure washer to shut off whenever you pull the trigger.

Issues to do with the pressure washer shutting whenever you pull the trigger usually stem from a problematic unloader valve. The unloader valve is responsible for cycling water back to the inlet by opening itself up.

Therefore, if the setting for your unloader valve is high, it might keep stacking the pressure washer engine whenever you release the trigger.

Therefore, whenever the unloader valve fails to open, there is a buildup of pressure inside the washer, causing the stalling of the engine.

Have you given thought to the pressure washer unloader valve’s O-rings? If these rings are in bad shape, they might fail in their duty to seal the oil pump. As a result, the unloader valve might also fail to work, leading to the engine’s shutting. Check O-Ring on Amazon

A problematic pressure gun might also cause the pressure washer to stall when you pull the trigger. That is especially so if it is in bad condition.

Pressure Washer Dies When Trigger Is Pulled: What to do

You need to follow several steps to fix the problem.

Step 1

Using a screwdriver and a wrench, unplug the unloader valve. You will do this by first removing the retaining pin, which keeps the unloader valve in place. This should be complicated since the unloader valve is easily visible.

To unscrew the pin, you enter the screwdriver inside the pin and pull it upwards to remove it. Thus, the unloader valve will be easier to remove since you have already removed the pin that holds it in position.

Step 2

After removing the unloader valve, remove the piston and inspect it. There is a nut that holds the piston onto the valve. The screwdriver should help you easily remove it. The piston controls the valve’s pressure retention capabilities.

The piston should move freely every time you turn on the pressure washer. If it doesn’t, then the pressure washer’s engine stalls.

Step 3

After removing the piston from the valve, use either kerosene or alcohol to clean it and eliminate any dirt. After that, grease it with silicone grease and set it back into the unloader valve.

That will allow it to resume normal functioning, which is moving freely. However, if you have noticed that the piston was moving freely, then there wouldn’t be any need for this step.

Step 4

Check the unloader valve’s pressure setting to ensure it is in the right setting. If the setting is too high, then the engine will have issues continuing operation when you release the trigger.

If the seating is too high, then the unloader valve won’t enable the water to cycle back into the inlet to release the pressure. The buildup of pressure will cause the pressure washer to stall.

If the setting is too high, adjusting t to the required level will help stop the pressure washer from stalling when you push the trigger.

Step 5

Check the unloader valve’s O-rings. If they are in good condition, then move on to the next step. If, however, they are in bad shape, replace them with new ones. Ensure the new rings are the same size as the previous ones.

Captain O-Ring - Power Pressure Washer O-Rings for 1/4" Quick Coupler, High Temperature Viton FKM (10 Pack)
  • Viton FKM Rubber is compatible with many chemicals and cleaners
  • O-Rings measure 3/8" Inside Diameter x 0.100" Thick. These 3/8"...
  • Compatible with temperatures up to 400F

Last update on 2021-09-16 / Affiliate links / Images from Amazon Product Advertising API

Deteriorated O-rings cannot seal the oil pump well enough, which may cause the unloader to malfunction and stall the pressure washer.

Step 6

If all the steps we have discussed, don’t help:

  • Check the pressure gun for any issues. If it isn’t in a good state, then replace it.
  • Check for any issues in the air filter and clean it
  • Use alcohol to clean the spark plug
  • Check the wand screens

Last update on 2021-09-16 / Affiliate links / Images from Amazon Product Advertising API

If all the above fails, you can decide to take it to a pressure washer expert to see whether they can repair it. If not, you can choose to buy either a new unloader valve or a new pressure washer.

Read Also: How to Clean Pool Tile with Pressure Washer

Important Points to Remember

  • If you decide to get a new unloader valve, ensure you buy from certified dealers to avoid getting an artificial valve. If possible, you can purchase one from Amazon to be assured that it is genuine.
  • Remember to do regular maintenance of your pressure washer to prevent issues. It is advisable to clean out the inner parts from time to time.
  • Before deciding to seek a repair, experts help ensure the expert is well versed in handling such devices. You don’t want someone to damage a functioning washer in the name of repair.

Final Thoughts

We hope our guide helps you solve your issue when your pressure washer shuts off when trigger is pulled. Follow all the guidelines we have laid down for you. It will be easier to diagnose the problem and find a suitable solution.

Remember to keep the pressure washer in good working condition to prevent any issue with the engine suddenly being faulty.

All the best.

Relevant Resources:

  1. Top 5 Best Mrliance Pressure Washer Reviews
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  4. 10 Best Pressure Washer Soap, Detergents, & Chemicals
  5. Top 7 Best Pressure Washer Surface Cleaner Reviews
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