You have to get the manure from the dude by the hay bales
In Astro Knights Island on Poptropica, the fuel for the hovercraft can be found in the fuel canisters located next to the dock where you first arrive on the island. You need to collect the fuel canister and use it to power the hovercraft to cross the toxic swamp.
The hovercraft runs on manure.
The fuel rod powers the saucer Excalibur. The hovercraft runs on manure.
The hovercraft takes you out to the crashed saucer Excalibur in the mud swamp. To repair it, you will need a new green fuel rod. (see related question)
To obtain manure for the hovercraft fuel in Poptropica's Astro-Knights Island, go to the farm on the main planet and explore the barn. You will find an item called "Excrement" there which can be used for the hovercraft fuel.
you get in in the Ye old rummor Mill in Astro Knights at the top
Go to the mud and you'll find it there. As soon as you fuel it, it stays right there in the swamp.
Once you have the hovercraft from the attic of the mill, you can bring the fuel rod to the saucer (Excalibur) and use it to launch into space. The cordinates are X-56 Y-52.
It goes to the mud swamp, which is the only place that you can use it.
The hover board (hovercraft) runs on manure.
The hovercraft (hoverboard) is powered by manure. To get into the attic of the mill, pull the rope inside to unlock the gears. Clmib on the windmill arms and turn them counterclockwise to open the roof dome.
The hovercraft will carry you over the mud swamp to reach the crashed saucer Excalibur. (see related question)
The fuel rod replaces the damaged one on the saucer Excalibur, which is crashed in the mud swamp to the right of the Mill. Get the hovercraft from the mill attic to reach it. (see related questions)