Once you have found the leakage of the tank, stop spraying water over it and remove the plastic cover above the air compressor to take another look. Keep your tank full of air, but don't behave exactly what's leaking, you've already identified the leak.
Brush the fittings and joints with a brush to find the leak. If the faucet has leaking air, the water-soap mixture will indicate the leaks, as bubbles will form immediately. When the air escapes from a valve, the compressed air will leak out of the air compressor tank.
If your air compressor has a pressure switch with an external discharge valve, make sure you also soapproof it thoroughly. If you find that the pressure switches and discharge valves of the compressor are constantly leaking air, look for at least one of the leaks in the air compressors. When the air compressor reaches the normal shut-off and standstill time, it causes a leak when it comes to a standstill. Even if the air compressor is switched off, you may find that air leaks from the valves connected to the pressure circuit.
If the pressure switch or discharge valve is continuously leaking after the compressor stops, this shows that the check valve of the tank has not completely closed and the compressed air is no longer trapped in the tanks. If you turn off the air compressor, but it builds up pressure and your air valve or pressure switch continues to vent air through the discharge valve, this means that the check valves are leaking. You need to drain some air from your tank, separate the air pipes from the pump, remove all check valves from your tanks, inspect, clean and replace them as needed.
