The meat of it: What happens to fuel leak if it's flipped facedown before its triggered effect can resolve?
From what I can tell, if Lieutenant Tavson has fuel leak and suffers a crit, both Fuel Leak and Tavson trigger, and the player can order those effects in either direction because Fuel Leak is a card ability, not a game effect. If so, this creates an interesting and bizarre situation. Tavson can use his action to repair Fuel Leak. Fuel Leak is now both facedown, and in the ability queue.
Does Fuel Leak's ability queue instance resolve, thus repairing the card again (and discarding it) and assigning another damage card, or is it prevented from resolving because it's facedown and doesn't "exist" now? It might seem trivial since you end up with the same number of damage cards, but other effects could trigger on receiving new damage (Tavson again, Hull Breach, etc).
The one thing I can think of that might shed light on this is, repairing Wounded Pilot prevents it from resolving, because it's facedown by the time it would do anything. But it's more like it's facedown by the time it would be triggered , so nothing enters the ability queue in the first place. So I'm not sure if that helps us.
edit: as I think about it, this applies to Direct Hit too.
What umm... what do we do with this? I'm not sure whether we have the information to produce a clear and reliable resolution, or if it's going to be mainly speculation and inference. But if there's a clear answer, I would love to hear it!
Edited by Wazat