Thanks for the post!

First, we want to make sure the head Unloaders are lubricated. This is a moving part with O-rings so want to make sure it is lubed and free moving. If the Unloaders are okay we want to make sure the valves were installed correctly. If they were somehow mixed up we could have these symptoms as well. The thinner springs are the Intake valves, the thicker springs are the Exhaust valves. My personal opinion is going to be the Valves/Unloaders are either not in correctly or they are just not sealing.

Let us know if this worked for you or not, if not we'll get the answer.
Thanks!
- MTR

I asked a manufacturer rep, and he said that IF the valves are used then it's possible that over time and in the amount of heat that they endure that the springs may be worn out. If they are brand new then we have an issue with the valve plate and where the valves seal.

Are the springs are worn or too weak then it could certainly explain the issue.
- MTR

Well, the tank is obviously back-feeding pressure through the Discharge Line and to your pump, out of the air filter.
To prevent this I was certainly recommend you install a Check Valve in the tank, which the Discharge Tube will thread into. Right now you just have an adapter, no check valve; this will ensure that it keeps the air in the tanks after shut-off/idle.

I assume it's a flare-style fitting so if you click on the below link you can find these on our site:

www.mastertoolrepair.com/check-valves-fl...ctf-style-p-246.html

I think this would take care of it. As for the engine stalling when the tanks are pressurized, I think you just need to adjust the idle screw on the engine, it seems the RPM is set too low.

If still the problem persists, I'd really recommend speaking with a helpful tech at Emglo direct, you can contact them at 888-425-3669.

- MTR