Did the part from Tendrara to Bourfa (I came riding over the Platteau du Rekkam), there's a fuel station in Tendrara. Road itself is good, fast and boring as hell.
In Bouarfa is one hotel, stayed in the conference room on my Thermarest since the hotel was fully booked. And it was storming outside.
From Bouarfa towards Errachidia, it's a long stretch of mostly boring road, allthuogh the scenery can be nice to watch. If I'm correct, you're gonna pass one village, there you can find fuel, but it's in 10l jugs. And double the normal price rates.
Make sure to fuel up in Bourfa (coming from the north you can fuel up even before the city) and Errachidia, or if taking to the left, the Gorge du Ziz shouldn't be a problem.
Grtz, Philip!