Why Graco Paint Sprayer Won’t Stop Running? [3 Reasons]

It is very irritating having unanticipated paint sprayer issues in the middle of a project. All paint sprayers, whether Graco paint sprayer or another brand, will have trouble at some point. But sometimes the faults are due to faulty setup and other times it’s due to worn parts.

Now, why Graco paint sprayer won’t stop running?

The difficulty is caused by a number of factors. Mostly your Graco paint sprayer’s dirty threads, worn-out gaskets, or too tight needle stop nuts are the reason for this problem. We’ll go through some of the issues you could be having with your Graco paint sprayer so you can troubleshoot and solve them.

These typical issues and solutions are applicable to any sprayer brand, not only Graco. So, let’s start with the most likely explanations-

3 Reasons Why Your Graco Paint Sprayer Is Leaking & It’s Fix

Paint leaking from the spray tip housing may quickly become a painful situation if you don’t figure out what’s causing it. You may not notice the paint leaking until it has progressed to the point where it is leaking from the housing. 

This is typically often due to a problem with the spray gun. The major causes of the issue might include-

1. Dirty Threads Causing a Poor Seal

Dirty threads accumulate paint over time. As a result, that prevents the tip guard from properly screwing on to make a tight seal.

You should check out the threads of your Graco paint sprayer thoroughly. Make sure it’s completely clean. Otherwise, resolve the issue by following the steps below.

Clean The Threads Which Cause a Poor Seal

Your spray gun’s threads should be cleaned. Check the threads on both the spray gun and the tip guard to see whether they’re dirty. 

Then, remove the dried paint from the thread completely. Hence, to clean and cure the problem, use paint remover.

1. Worn Out Gaskets

The rubber gasket within the tip guard deteriorates over time. Especially, if the sprayer is wiped with paint thinner or lacquer thinner. Inspect the gasket to check whether it’s damaged or not well installed. Follow the solution below-

The Gasket Should Be Replaced

Check the gasket to see whether it’s fractured or not well installed. 

If it’s loose, use your finger to press it back in.

Here, the paint will seep out if the gasket does not make a suitable seal, just like the threads on your tip guard and spray gun. If the gasket is broken, replace it.

1. Too Tight Needle

Fluid leaks or drips from the front of the pressure feed gun when the needle stop nut is too tight. You can ensure the problem by checking the tightness of your needle stop nut. Then follow the step to fix this problem.

Loosen The Stop-Nut

Check out the stop-nut. If that is too tight, then loosen it with the help of a screwdriver. 

Because the stop-nut which is too tight can cause the leaking problem. Spray by pulling the trigger. Using a tissue, dry the fluid nozzle’s tip once again.

3 Reasons Why Graco Paint Sprayer is Spitting and It’s Fix

Spitting may be a concern when painting delicate finishes like cabinets and doors. The easy remedy is to acquire the habit of releasing the trigger beyond, rather than over, the substrate you are spraying. 

However, if your Graco spray gun is spitting excessively, there might be one or many causes. Some of the reasons why your spray gun is spitting severely are listed below-

1. On the Tip Guard, There is a Build-up of Material

If physical hazards have accumulated on the sprayer’s tip guard. It’ll disrupt the natural flow and cause spitting.

Tip Guard Should Be Checked

Another common reason for spray gun spitting is a blockage caused by paint build-up on the tip guard. 

If the tip guard isn’t kept clean, wet paint can pool just outside the spray tip’s aperture. The stored paint is blasted onto whatever you’re spraying when you pull the trigger.

1. The Fluid Hose And Pump Are Both Filled With Air

Air may easily enter pumps through suction line breaches at bends, couplings, and other points. It’s fair to assume that if fluid is leaking, the air is leaking as well.

Pump Up The Tank

During setup, your Graco sprayer should have also been primed to reduce air from the pump. Air becomes trapped inside the pump and tube without priming. This results in spitting.

If you didn’t prime the pump, disconnect the pressure and cycle through some paint to clear the air. You should always do this before spraying.

1. Graco Paint Sprayer Assembly is Unclean & Rusty

Paint particles attach to everything within the sprayer if you don’t flush the paint out with the right cleanser and clean the components completely. It can then result in a loss of pressure or issues with the spray gun.

Remove The Fluid Needle & Clean It

If you’ve exhausted all other options, dismantle the sprayer and inspect the fluid needle. Certain coatings, particularly solvent-based coatings, are sticky and can accumulate around the needle, causing issues. 

Try thoroughly cleaning the needle and the interior of the sprayer.

If none of this works, the packings and components are most likely worn and need to be changed. Choose a kit designed specifically for your Graco paint sprayer.

FAQs

Conclusion

Hopefully, our troubleshooting guide has resolved any problems you’re having with your Graco paint sprayer. We hope that now you can find out why your Graco paint sprayer won’t stop running. 

As you know why it’s not running, you’d probably wanna follow our solutions. But, be careful with it. Firstly you need to consider the right reason for the sprayer not working. Then, go ahead and select the best solution for that. 

Sounds easy? Why don’t you give it a try? Best of luck!