Help with auxiliary air tank

[sxg6]

I have an old 8 gallon husky air compressor, and I connected it to a harbor freight 12 gallon air tank.

I only have a regulator on the husky tank. When I reduce pressure at the regulator, it just bleeds air non-stop, and the regulator psi doesn’t drop.

Do I need a 2nd regulator at the entrance to the aux tank? It seems like that could stop the back flow?

 

[Rand]

You need to connect the aux tank before the regulator.

you should have tank 2 connected to tank 1 then the hose coming off the regulator separate.

not inline.

With the current setup the regulator is only letting the regulated air pressure into the second tank.. you want it at full pressure.

EDIT:
if you want to keep the current setup. you need to disable the air pressure regulator.. ie set it to max.

then add one at the exit from the second tank before the air hose. (not the input side at tank)

see arrow

 

[sxg6]

All set, thanks for the reply.

I tried option 1. Removed regulator, and tried connecting the hose there (pic 1), but hose wouldn’t thread in, the compressor side wasn’t NPT. The coupler and regulator weren’t npt either (pic 2).

So I went with option 2 and put a regulator after the tee on the aux tank. Max psi on the aux tank is 125, so I set the husky side regulator at around 122psi (even though I’m sure tank could probably far exceed 125 listed).