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Go to the mud and you'll find it there. As soon as you fuel it, it stays right there in the swamp.
coal
Coal
coal
you get the alien fuel then click the ship in the swamp next put in the alien fuel put the circle to 50 and put the other circle to 52 then click launch
coal. coal is formed.
Coal.
Coal.
you have to go through the vent in the dungeon and make the alien self destruct and then you click on the owl, then the fuel rod and you get it.
To get the ship fuel you must go into the jail cell through mordred's cave. The bot will self destruct. Use the owl to get the fuel while you are in the jail cell. Do this by clicking on the owl then on the fuel rod then on yourself. Now you have FUEL!!
After you get the fuel rod in the dungeon, go to the spaceship in the swamp. When you reach the ship, the rod will be in the bottom left corner. Click it and drag it to the broken one. To reach the crashed saucer Excalibur in the mud swamp, get the hovercraft from the attic of the mill. (see related question)
The fuel rod is broken on the saucer Excalibur, crashed in the mud swamp. You will need a new one, and someplace to fly the ship to. (see the related question)