[Richard]

Let’s start by putting the shutoff valve right at the six pack. As you look at the front of the six pack, the air line feeding the left will be at the upper left on the rear of the six pack. The lines feeding the bags are the two at the rear ward, the two at the front next to the bulkhead are coming from the height control valves. The big (usually blue) line coming in the side of the six pack manifold is air to raise the suspension when in level mode.

By putting the shutoff valve between the six pack and the bag system you will determine if the leak is in the six pack or in the bag system.

If it’s in the bag system it could be a number of things: air fittings, the tanks themselves, the air bags, the up and down three way valves on the tag system.

The next thing I would do is isolate the tag bag, only because it is the easiest thing to do.

Isolation after that becomes a bit trickier and will require adding some JIC fittings for those huge hoses that you referenced.

Let’s start with easy and simple.

I am not going to speculate on an offender unless the drive bags look newer and they are Goodyears. If they are I am going to refer you to the Goodyear air bag burping thread.