Gravity Feed?
OK, obviously the engine could not gravity-feed.
And I suppose the reason is "because they didn't design it that way".
Excuse my ignorance: I thought all wet-wing aircraft with under-slung engines could gravity-feed fuel to the engines if you kept the tank above the engine full.
So my question is "Why did they design the A-380 so that it can't gravity-feed?"
Or are you saying that the failure of one of the pumps blocked the fuel line to the No. 4 engine?
Curious minds...