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I have a unit or artillary consisting of 2 guns and 4 crew.
An enemy is able to see one member of the crew with the rest hiding in some ruins (and so can shoot the unit) but all of the shots land on the gun.
What happens next?

Roll's to penetrate are made and there is one succesful glance/pen.
So now i can take my obscured cover save, for ruins this would be 4+

But in the obscured section of the BGB is states obscured saves can be 3+ if the firer cannot see the facing of the vehicle it is firing at and are instead taking a shot at another facing that they are not in the arc of but can see.

Now, the firer can see no facings so would the save be 4+ or 3+

Edit:typo

However the 3+ save seems to only apply if they are shooting a facing they CAN see, if they cant see any facing it seems like this 3+ save doesnt happen, as the criteria for obtaining it isnt fulfilled.

I would imagine that a 3+ save would be appropriate, but the rules dont seem to support it...

It would seem by the rules that the gun would only get a 4+ cover save due to being obscured, since no facing at all can be seen.

nosferatu1001 and time wizard have it spot on. The 3+ save is only for when you can see a Facing but not the facing you are in, not for when you can see no Facing.