understanding Command and Supply

[Steelwhip]

Ok...ive been having some issues with command and control and supply. 

Currently playing the '56 campaign in Middle East '67 (explicit supply is on)

What im reading in the rules doesnt exactley mesh with what im looking at happening in game. For example fuel shortages-it says to fix a fuel shortage a unit needs to be in command range of its HQ when the midnight turn rolls around. I have done this with units low on fuel and not only have the units not been restocked but other units in the formation (in HQ range) have gone low on fuel.

So im guessing im not understanding command and supply as much as I thought I did.

anyone want to give a basic rundown on how its supposed to work in game. 

thanks in advance!