Looks like the contamination runs up pretty far, well into the box. I would worry about not getting all of it.
Wow, that post puts a whole new twist on the problem. I'll have to find the original post. The vent is attached on the side? That makes no sense, and does explain why half of the tank's contents run out. Again, that leaves us with a 17 gallon tank and not 35. The vent on my R-pod is attached on the top, so my my Coleman popup. So that means I won't be able to completely solve my problem by digging in from above - although I would need to anyway to run the vent to its proper spot next to the fill spout. I'll need to find out which side and approximately where and then cut in from the outside, which I was hoping to avoid.
2008 FR Salem 26TBUD
2010 FR R-Pod 171 (2009-2015)
2010 Chevy Suburban
Honda EU3000is inverter-generator