well mine isn't sitting on the bumps stops.... thats odd that it's powerful enough till lift the rear end of the car but not powerful enough to fill a tank or tire...

 

From what you describe, it looks like the previous owner, did just what they explain in the Haynes Extreme LR Discovery Manual, pages 91-93. It sounds like a nice setup, for the times that you need the extra support for hauling. They do caution that the unit should be kept at a min. of 5 PSI when you're not hauling, so as to keep the bags from chaffing. It does seem a shame though, to have the disconnected SLS compressor, not available to use for other things like filling an air tank, tires, etc...

Jeff5123: If you don't have access to the Haynes book, PM me.