Christian, I would consider changing that air filter. I had one just like it, and one time when the aforementioned impeller pump failed, it spewed water at it, didn't keep it out and when attempted to start engine it froze completely. Water in the cylinders. Pull injectors, turn over to expel water, bleed fuel lines, change oil and all was well again. Lucky it didn't sit that way for longer, would have totaled the engine. Can't remember what I replaced it with, was aftermarket and water resistant. Pretty inexpensive as well. Also actually filters the air too, which that one didn't do so well, at least in my experience.
I'll try to remember to check the brand next time I'm up there. Pretty sure I got it at O'Reilly's Auto Parts, will check.