Yeah, #9 had me stumpped forever. Here is the trick. When you come through that door where you need the yellow key to get through, and see the Trandoshan waiting by the fuel switch, ignore the switch on that floor. The only switch you have to flip, is on the floor directly under the top one. That will lower the fuel to a level where you can cross the bridge inside the fuel tank. Once that switch is flipped, just find the wrench, go to the lowest floor and the door with the ugnaugt beside it. Simply open the door, close it behind you, and open the door across the bridge in the fuel pipe
Another tip, whenever you go through a door that leads to a room full of fuel, close the door behind you. If you don't, you won't be able to open the next door.
Another tip, At a point in that level, you will come to a very large perfectly round room with blaster proof walls and no powerups, you will see a closed hatch in the center of the room on the floor. I sat on that thing for probably an hour, first trying to activate it, then using the rail gun, then thermals, then all of my sequencers, but that thing will not open unless you simply pull out your lightsaber and slash it. however, that room is fun to play in by bouncing laser blast around it.
So, anyway, hope that helps, and good luck.
If you have anymore questions about Jedi Knight, just ask me. I know all the secret areas and cheat codes if you need them.
BTW welcome to the boards.
[ July 02, 2001: Message edited by: JediKnight_114 ]