Why Is the Pressure of My Airless Sprayer Too Low or Too High?

Pressure issues are one of the most common problems with airless sprayers. Whether the pressure is too low or too high, it directly affects spray quality, paint consumption, and equipment lifespan.

Here is a complete guide to understanding and fixing the issue.

Why Is My Airless Sprayer Pressure Too Low?

Low pressure typically results in:

• Uneven spray pattern
• Poor atomization
• Spitting
• Inconsistent coverage

Possible Causes

1️⃣ Worn or Incorrect Spray Tip

A spray tip that is too large requires more output than the machine can deliver.
A worn tip reduces efficiency and spray quality.

Solution: Check the recommended tip size and replace it if necessary.

Find our nozzles in the Airless Discounter shop

 

2️⃣ Clogged Filters

Blocked filters (gun filter, pump filter, or inlet strainer) restrict paint flow.

Solution: Clean or replace filters regularly.

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3️⃣ Air Intake in the Suction Line

Air leaks reduce pressure stability.

Solution:

• Inspect suction hose
• Check seals
• Ensure the inlet strainer is fully submerged

 

4️⃣ Paint Too Thick

Highly viscous paint requires more pumping power.

Solution: Thin according to the manufacturer’s recommendations.

5️⃣ Worn Valves or Packings

Damaged valves or packings prevent proper pressure build-up.

Solution: Inspect the pump repair kit and replace worn parts.

Why Is My Airless Sprayer Pressure Too High?

Excessive pressure can cause:

• Excessive overspray
• Faster spray tip wear
• Increased paint consumption
• Reduced finish control

In most cases, the issue comes from the pressure sensor.

Main Cause: Dirty or Defective Pressure Sensor

The pressure sensor regulates pump pressure.

If it is:

• Clogged → incorrect readings are sent to the system

• Defective → pressure regulation fails

This often leads to abnormally high pressure.

✅ Solution

1. Remove the pressure sensor following manufacturer guidelines.

2. Clean it thoroughly.

3. Inspect for visible damage.

4. If the problem persists → replace the sensor.

⚠️ Always relieve pressure and disconnect power before servicing.

Preventive Maintenance Tips

• Clean the machine immediately after use
• Inspect filters regularly
• Use the correct spray tip size
• Follow paint viscosity guidelines
• Perform regular preventive maintenance

When to contact a specialist?

If, after checking:

• The pressure remains unstable.
• The machine increases pressure without stopping.
• The motor runs continuously without building up pressure.

It is advisable to have the appliance checked by a professional.

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