I also think it might be a bad design or sloppy manufacturing of the anti-drain back valve (ADBV). I've seen ADBVs made of thin metal/plastic and cheap looking springs. Somehow they get easily stuck open. But it occurs after years and years of service.
I see an expensive recall coming for an expensive car. In the meantime, Accusump would make a killing from some OCD Genesis owners.
I see an expensive recall coming for an expensive car. In the meantime, Accusump would make a killing from some OCD Genesis owners.