[HUMTECH]

If the compressor runs for 20-30 seconds without a height change it will set a code and disable the air ride. If your positive you have no leaks it sounds like the compressor may be too weak to inflate the springs. As easy Ed said if the inlet filter is plugged this could also be the problem, no inlet air=no output from compressor. Check the filter, if its plugged remove it and see if it works. If thats not it try to raise the rear of the body a few inches with a jack under the receiver hitch and see if the bags start to inflate, if so the compressor is jus weak. If all that fails a new compressor is likely in your future, the new compressor will need to be upfitted with new air lines as well if you still have the older single stage unit. Make sure these are ordered with the new unit.