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Why Is My Paint Spray Gun Spitting? – Perfect And Detailed Answer For You

Paint sprayers can give you lots of benefits as they easily deal with painting tasks from small objects like benches to massive projects like your entire house. However, if your sprayer gun got worse and spit badly, you would have to spend more time fixing the gun and the decorations.

Are you wondering, “Why is my paint spray gun spitting?” Well, you’ve come to the right place! Let us share useful information about the reasons and methods so you can get your paint sprayer gun back soon.


A Paint Spray Gun Is Spitting.


Why Is My Paint Spray Gun Spitting? – Let’s See The Causes And The Best Solutions

Before fixing the problems, you need to understand what your pain sprayer is dealing with.

There are various reasons for a bad paint sprayer gun, but here are the main basic ones from our experience and other users:

  • Low pressure
  • Worn and dirty gun body
  • Air in the pump and hose
  • Tip guard with accumulation

Now, we will introduce to you the ways to run a test on your paint sprayer. If you can see your paint gun’s conditions like the ones we mention below, congratulations! You can get back to your decorating projects in no time with our up-next detailed solutions.

So, keep reading for your question, “Why is my paint spray gun spitting?


Bad Spitting Paint Sprayer

Fluid Nozzle

The fluid nozzle should be the first thing you check with the spray gun. If the nozzle is not in the right position of the spray gun’s tip, it will allow lots of air to get into the fluid supply. Consequently, the bad spitting situation will start.

To solve this problem, tightening the nozzle properly again would be the best option. However, if you have difficulty trying to secure the object, please look at the spray gun’s head to check the stripping condition in the nozzle’s fluid threading or the fluid seat.

Suitable Air Cap

When using a suction or Siphon Feed Spray gun, a proper air cap is one of the most important factors. In this case, please remember to not use the pressure feed spray gun’s air cap. The reason is that this type of cap can leak the air out while air is responsible for the spraying process.

There will be no terrible spitting circumstances by following this rule, and the gun can work perfectly. If you used the pressure cap, there would be no air to supply fluid to the sprayer, and the suction effect would not happen.

On the other hand, if you use the airless spray gun, prime the tool before spraying for air removal in the pump. If not, spitting will start, and air keeps staying inside the hose and pump. You can also release air and pressure by spraying some paint as a draft or cycle through the material.


After checking and knowing that your fluid nozzle and air cap are in the right positions, the nut’s packing might be the reason for the terrible spitting. With this situation, please check the packing and tighten it properly. Simultaneously, purchase the new packings if yours were getting worse or did not have enough items.

Fluid Connections

Please tighten and strengthen the connection between the fluid and your paint sprayer, especially with the pressure feed spray guns.

Suction Or Gravity Cup

We recommend you check and tighten the cup into your sprayer for suction or a gravity feed spray gun. Besides, test the cup’s threads to ensure no stripping situation and check the sprayer’s threads for a perfect shape.

If one of these pieces is not in good condition, replace them immediately with new ones.

Viscous or Heavy Material

Sometimes, the painting material is too dense for the suction feed spray gun to operate properly. If you prefer this type of paint sprayer for the painting jobs, the best options are to choose the air cap with higher CFM or to increase the fluid nozzle.

FYI – CFM or Cubic Feet per Minute – this term can show you the level of the airflow in your paint sprayer, and there are different CFM levels in different paint guns. Also, you should know that caps with higher CFM can draw and drive the material to the nozzle more effectively.

Accumulation In The Air Cap

Please check and make sure the paint is not blocking your air cap with the suction sprayer. Otherwise, carefully clean the item with a suitable cleaner. If you can’t give the tip guard the perfect condition to work, the wet paint can gradually stop right on the exterior spray tip’s opening. Consequently, the gun will blast the paint right when you start pulling its trigger.

Low Pressure In Fluid

As we mentioned earlier, low pressure is one of the main reasons for bad spitting. When the pressure is too low, the paint won’t come out fully, especially when working with thick objects.

The reason for this problem is that there isn’t enough pressure on the coating to effectively support the gun. To clear this mess, you should put more pressure then use the knob to adjust the fluid amount back to a suitable level.

When checking, if you are experiencing both issues – damaged spray pattern and bad spitting, you may need to check the size of the spray tip. In this case, it would be ideal to try a bigger-opening spray tip.

Building Up In The Passage

Use the proper cleaner to clean your spray gun’s fluid passage. This step will help you remove any hard particles that are sticking inside the sprayer. If this problem keeps happening too often, straining the paint before spraying or equipping the sprayer with a fluid filter would be the best option.

Besides, if other parts of the gun are fine, disassemble the sprayer and check the needle. Like the solvent-based one, some kinds of paint are quite sticky and can increase around the sprayer needle.


And those are the best ways for you to check and find the causes for the terrible spitting from the sprayer. Hopefully, you can successfully fix your sprayer and get back to your projects.

By the time you are reading this passage, we believe you can answer your question at the beginning, “Why is my paint spray gun spitting?“. Good luck!

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