[Yuan Xue Lim]

Originally Posted by Al Skierkiewicz

Yuan,
The low side pressure can only remain at 60 psi if the high side pressure is greater than 60 psi. If you open the vent valve, both should return to zero. Is that what is happening?
If the high side pressure is falling after you turn off the compressor and nothing else is moving, then you have a leak in the high side. This could be a hose that was not cut flush, a leaking pressure relief valve on the compressor or a fitting not fully screwed into a component.

We are trying to use precharge tanks so i use the vent valve to open and close the feed in valve. Only the high pressure side is leaking and the low pressure side is perfectly fine and doesnt move at all. there is no air leak to be found anywhere on the high pressure side. Is it possible to be other problem?