tank leaks down

[ch powell]

I have tighten up all of the fittings and I have replaced the drain valve. No signs of where the air is going. The unit pumps up to 110 psi just fine. After several hours (5 or more) I go and check and unit is back at 0 psi. Any suggestions as to where the air is leaking?
Thanks

[Mark]

Hi ch powell,

I would suspect that the check valve may be leaking. It will allow air to leak back to the cylinder head where there is a small vent hole which allows the air to escape. The check valve is part #A19712 and is available from http://www.ereplacementparts.com.

I hope this helps with your repair!

-Mark