You could post a pic of your control panel to help ID the system. Either way, if you are just dumping air, then leveling hydraulically, you dont need fhe engine running. If you are leveling with air AND the system doesn't have its own compressor, then yes you would probably need the engine running to air up as necessary to level. But it sounds like you are just lowering the coach by dumping the air in the bags to get the most out of your hydraulic jacks.