Why Is My Air Compressor Pump Not Building Pressure?

The Top 5 Reasons Your Air Compressor Pump Is Not Building Pressure

It can be frustrating when you turn on your air compressor and it fails to build pressure. If you're facing this issue, don't worry! In this blog post, we will explore some common reasons why your air compressor pump may not be building pressure and provide you with troubleshooting tips to help you identify and fix the problem.

1. Leaking Air:

One of the most common reasons why an air compressor pump may not build pressure is due to air leaks. Air leaks can occur at various points in the air compressor system, including the hoses, fittings, valves, and even the tank itself. If there is a leak in the system, it can cause air to escape, resulting in insufficient pressure buildup. To check for leaks, inspect all the connections, fittings, and hoses for any signs of damage or wear. Tighten loose connections and replace damaged parts as needed. One easy trick to find air leaks is to fill a spray bottle with soapy water and liberally spray water on every fitting and location in which air could potentially leak from. If you have an air leak, the soap will visibly bubble and you have found your weak point.

2. Faulty Pressure Switch:

The pressure switch is a critical component of an air compressor that controls the motor and the pressure level. If the pressure switch is faulty, it may not engage the motor to start or stop at the appropriate pressure settings, which can prevent the compressor from building pressure. To troubleshoot the pressure switch, check if it is set to the correct cut-in and cut-out PSI ratings, and ensure that it is functioning properly. If not, you may need to replace the pressure switch with a new one.

3. Worn-out Piston Rings:

The piston rings in the air compressor pump are responsible for creating a seal between the piston and the cylinder, allowing for proper compression of air. Over time, these piston rings can wear out or become damaged, resulting in air leakage and reduced pressure buildup. To inspect the piston rings, you may need to disassemble the air compressor pump. If you notice any signs of wear or damage, such as scoring or cracks, it's time to replace the piston rings to restore proper compression and pressure buildup. Oil-bath pumps typically have three steel rings per piston (an oil ring and two scraper rings), and an oil-free unit has a single Teflon-coated composite ring. There should be no gap or light visible between the cylinder wall and the piston ring(s).

4. Dirty Air Filter:

An air filter is designed to trap dust, debris, and contaminants from entering the air compressor pump. However, over time, the air filter can become clogged with dirt and debris, restricting the airflow and reducing the efficiency of the compressor. This can result in inadequate pressure buildup. To fix this issue, clean or replace the air filter according to the manufacturer's instructions. If you replace the air filter and the compressor still fails to produce much air, remove the head and inspect the valves in the valve plate because debris could be lodged in the valves, inhibiting compression.

5. Insufficient Power Supply:

Air compressors require a steady and sufficient power supply to operate properly. If the power supply to your air compressor is inadequate or fluctuating, it may not provide enough power for the motor to operate at the required speed, resulting in low pressure buildup. Make sure that your air compressor is connected to a dedicated circuit with the correct voltage and ampere rating. If you're using an extension cord, ensure that it is of the appropriate gauge and length to deliver sufficient power.

When your air compressor pump is not building pressure, it can be frustrating and hinder your work. However, by troubleshooting the common issues mentioned above, you can identify the problem and take appropriate steps to fix it. Remember to always follow the manufacturer's instructions and safety guidelines when working with air compressors or any other power tools. If you're unsure about any repairs, it's best to consult a qualified technician. With proper maintenance and troubleshooting, you can restore your air compressor to its optimal performance and continue to enjoy its many benefits in your DIY projects or professional applications. Contact Master Tool Repair with any questions about your air compressor pump repair project and replacement parts.