when i used it it might use the first cell intantly but the socond one stayed there for a while so maby try adding several in it.

I used the Full Reactor Fuel canisters that came with the mod, dont think it would even accept different fuel. Well maybe its a combination of mods that i use in my SE, i bridged the power gap i had using your solar panels :P

it dosent act that way when i tryed it in servival what fuel r u using?

thats strange i will look into it. any one else having the same problem?

Is it normal that the reactor uses up the fuel instantly? I tried filling its inventory via spöace master and i got it full only for it to disappear within a few seconds

theirs realy not much more i can screenshoot r u wanting anythaing inperticular?

Hi are you able to provide a bit more screenshots? :)