Yes there is a problem with deisel in Western Desert.
We have just returned from the Western Desert, we went north to South, there were very long queues at every oasis. Even tour companies are struggling.
However as tourists we managed to top up at 3 oasis with little queueing due to the kindness of the Egyptians who allowed us to go to the head of the queue in Bahariya, In Mut we came across a very small queue at the back end of town and topped up, then in Khaga the tourist police took us to a place to fill up with no queue, it was for emergency vehicles only. they told us to always check with the tourist police who will help get diesel.
The tourist police escorted us in a couple of sections from Kharga to Luxor, but not a problem as they just followed on behind. Have a great time, we agree with the above comments to carry extra jerry cans or containers.