My Husky compressor blowing out air from the unloader.

by Johnny
(Lake Placid, Fl)

I have a husky pro 26 gal upright compressor, model number VT631502AJ. Compressor turns on and shuts off automatically fine, but the problems is once it reaches max air pressure and auto shut off is blows air from the unloader. I pin pointed where it was coming from and I ask the same question earlier, but wanted to make sure if its the check valve for sure. Thanks for the first response again.

Husky Pro VT631503AJ air compressor

Husky Pro VT631503AJ air compressor

You need to turn off the compressor, empty the tank of air, pull the compressor check valve, and ensure that it is doing the job it’s supposed to.

If air can bypass the check valve it will continue to blow out the unloader valve (while the compressor is off) until the pressure in the tank bleeds down to the point where the compressor cuts in.

If the power to the compressor is off, the tank will fully empty through the unloader.

So, first, check the tank check valve.


Husky 7 hp compressor leaking air at or around the valve

by John
(Detroit, Michigan)

My Husky 7 hp (peak) vertical 15 cfpm unit seems to be leaking air at or around the valve area. This is a new problem

This unit is 230 volt, two stage 80 gallon industrial-sized compressor. When I got it several years ago, and up until the recently, the unit would turn on, pump to 175 PSI, and shut off, all quietly.

Now, the unit seems to run non-stop, and I hear the sound of escaping air somewhere around and behind the pressure valves, other fittings on the mounting plate for the dials, and knob that you turn to regulate the final pressure — I can’t really tell where the air is coming from.

Something has changed, and I am not sure what. All the fittings seem to be tight, and the unit eventually makes pressure, but the “leaking air sound” is new, and the unit takes much longer to get to 175 psi.

Can you help?



John, it is difficult to be sure since you, and by extension me, don’t know where the air is leaking from.

You don’t include a model number so I can’t find a photo of your compressor to try and see the problem from afar.

What it may be is that the tank check valve (see that page for details if you need them) has debris or has failed close a bit, and air is bleeding back out when it shouldn’t.

If this were my compressor I would power down, drain the air, pull the line from where it enters the tank, pull the check valve, and either clean or replace it.

Then power up and see.

Let me know what you find as a comment here, please.




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