[rheavn]

You say you "tried the 110v compressor but nothing happened". Does that mean it came on but wouldn't build air pressure? or it didn't start up? The 12v compressor will air up the tank in the right wheelwell, so was it off? Are you at your shop where you can hookup shop air from an outside compressor? With shop air you should be able to hear a leak so big it won't build air pressure. I'll have to think about why your engine air compressor wouldn't build pressure on the supply side, but did on the braking side, unless there is a very large leak or a blockage in the supply system. Any thing is possible, but pinching a line by just dumping the air system seems unlikely to me-------but don't rule any thing out. Let us know what happens after hooking up shop air.