Hi , I doubt there is any fuel there, it is extremely remote.
I rode that route but nearly died. I carried 40 litres on bike and put 30 litrs on a 4WD (a local taking supplie to tichit from tidjikja) I followed the supply truck.
Its extreme terrain. but beautiful. navigation is difficult. if you want to do this trip, research thouroughy and go as a group , better with a paid guide.
even between Oualta and nema locals have perished.
Between Tichit and Oualata is where I had problems cos I (stupidly)tried to do it alone. difficult conditions can 'suddenly' appear.
see my account on
www.desertbiking.co.uk
cheers
Karim