How To Fix Pressure Washer Soap Injector

Pressure washers are very helpful if you want to clean a huge surface without wasting hours. Many pressure washers come with a detergent kit to easily and effectively clean the surfaces with the detergent you like. Cleaning the surfaces with detergent gives them a new shine and looks new. Still, it can be frustrating and annoying when you switch to detergent cleaning after regular cleaning and find out that the pressure washer is spraying water without any foam.

Well, many ways can cause the soap injector to malfunction, and if you do not know much about pressure washers, you have come to the right place. In this article, we will understand how to fix the pressure washer soap injector so you can easily overcome the problem. Let’s get started.

How Does A Pressure Washer Soap Injector Work

To understand the points of failure in the pressure washer soap injector, it is necessary to understand the working of the soap injector. The working of a soap injector is based on an orifice that constricts the flow of water for a narrow stream and creates a back pressure that pulls the soap from the container through suction. 

The orifice or the nozzle restricts the area of flow and increases the velocity, and it creates a pressure change that creates a vacuum which in turn pulls soap out of the container. Still, if the pressure stream is too high, then it will cause the water in the stream to go into the detergent container. To avoid the reverse flow, there is a valve at the head of the chemical injector. As a result, if the pressure is high, there would be no soap flow. 

So we can say that high pressure will restrict the flow of soap.

How To Fix Pressure Washer Soap Injector

Now you know the basic principle of soap injectors, the problem can be caused by these factors, and there are easy solutions for them, and you can fix your pressure washer injector in simple steps. These are the common problems that you can face:

Inappropriate Nozzle

The first and the most common cause for the soap injector not working is the use of an inappropriate nozzle that might restrict the flow of soap. Pressure washers have special nozzles; if you do not change the nozzle when using the detergent, it will not work.

The solution to this problem is very easy, and you must change the nozzle to a detergent-grade nozzle that comes with the equipment.


Detergent can solidify and block the nozzle or the valve, resulting in the inability to flow the detergent. The debris in the nozzle or the valve can also restrict the working of the soap injector, and you do not get any detergent at the end.

The solution for this problem is not too complex, and you have to open the chemical injector and check for any blockage or debris. You should also check the nozzle to see if it is working properly. There is an easy way to avoid the problem, and it is by using filters to prevent the system from building up. The filter will prevent debris formation and foreign particles from entering the pressure washer.

Worn Out Components

The equipment can malfunction if you use your pressure washer for a long time. Some components can also cause a disturbance in pressure inside the chemical injector kit that might lead to the inability of pressure washers to use the soap. It is also possible that the problem is not visible, and the problem is due to misalignment or misplacement of some component in the pressure washer.

The solution to this problem is long, and you have to find the actual cause that is not visible. One way to do it is to replace the soap injection kit, which would be very expensive. You can also change the component you think is in the most inappropriate condition. Now check the pressure washer to see if the detergent is getting out and if it does not, then the problem might be with some other component.

High Pressure At Inlet

It is also possible that the pressure washer cannot draw detergent because of the pump’s high pressure. Many pressure washers come with fixed internal pressure, and the soap injector kit is set according to that. Still, the problem can occur due to high pressure if you use a replaced soap injector kit or adjustable power pressure washer.

Luckily, the solution is easy, reducing the pressure gradually until the detergent starts to draw out from the pressure washer.


Over Mixing Of Detergent

It is also possible that the pressure washer detergent is mixing and flowing through the nozzle, but the detergent consumption is very high. As a result, the detergent is consumed quickly. It is not a problem but can affect the cost of cleaning when you are cleaning a larger surface.

The problem can be fixed easily by increasing the pressure washer to a little higher, reducing detergent consumption.

Not Enough Detergent

If you are not getting enough detergent at your nozzle, cleaning the surface can take extra time. Still, you can easily solve the problem by reducing the viscosity of detergent by adding some water.


In this article, we have discussed the possible causes of the problem of the soap injector in the pressure washer and their solution. We have also discussed the working of a pressure washer so you can check if it is working properly or not. The most common cause of the problem in soap injection is the use of inappropriate nozzles that you can fix easily. Blockage in soap injectors can also cause the problem. Still, you can easily avoid and fix that by installing a filter. You can also check for the worn-out components in the soap injector and replace them to solve the issue. 

If you are facing over-mixing or Mixing of detergent, the best way is to change the detergent with increased or decreased viscosity. You can also change the pressure to address the problem.

Jose Kelly