Fuji Spray

Help! My Spray Gun is Leaking!

My spray gun is leaking! Why? How do I stop it?

Over the years we have had some customers call and email us about why their spray gun is leaking from the tip of the needle, or the needle packing nut and what to do about it.

This particular issue is a simple fix and stopping such a leak is as easy as following a few steps.


The spray gun is leaking from the Nozzle
This occurs when the Needle Packing Nut is too tight, compressing the Needle Packing too tightly around the Needle.

The spray gun is leaking from the Needle Packing Nut
This occurs when the Needle Packing nut is too loose.

Remember that the needle packing must be tight enough to prevent any leakage of paint material. It should however, allow the needle to glide smoothly through it. If the packing is too loose, you will see a small amount of paint where the needle passes through the small needle packing nut. If the needle is too tight, paint will spurt out of the fluid nozzle when you release the trigger.

If you change to a larger or smaller needle, one of these needles could be slightly oversized and the other slightly undersized in diameter resulting in adjusting the needle packing.

The Simple Fix!

The adjustment should be counter clockwise when your spray gun is leaking from the nozzle, or clockwise when your spray gun is leaking from the needle packing nut.

IMPORTANT! You want to adjust the needle packing nut in very small increments. Just imagine that one full turn of the needle packing nut is an hour. You adjust this nut one minute at a time (a 60’th of a turn). This is a very subtle turn.

Make sure that there is water in the cup of your gun, and follow the steps below.

1) Make sure to dry the tip of the fluid nozzle with a rag, and turn the needle packing nut counter clockwise one minute.

2) Pull the trigger and spray. Dry the tip of the fluid nozzle with a rag again.

3) If you continue to have a leak at the fluid nozzle or needle packing nut, you repeat the steps above.

The needle should stop leaking after a few adjustments.

One Last Tip!

It is always a good idea to apply light machine oil or Vaseline to the needle shaft where it passes through the needle packing nut and work it in and out by pulling the trigger back and forth. This will lubricate the needle packing nut.

Below is a link to our cleaning video with addition helpful hints and tips on maintaining your spray gun.

Your Turn!

What are some of your tips on keeping your spray gun in tip top shape…?

Share your thoughts and questions in the comments section below, and don’t forget to share this post if you found it useful!

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Fuji Spray®

800 Alness Street, Toronto, Ontario M3J 2H5 1-800-650-0930 support@fujispray.com