With respect to the o-rings...my unit was working fine, then I latched on to about 3-4, maybe 5-6 tanks full of low-priced diesel at the Shell station...which just so happened to be the ULSD.

All of a sudden, my drain was leaking diesel like a siv. I tried the open-close attempt a couple of times, still no use. So I ordered the new o-ring kit, let my baby sit for 4 days, then installed the new rings...and all is fine. However, I haven't returned to the ULSD station, and surprisingly, the o-rings that I removed looked every bit as in good a shape as the new one's I installed.

Oh well. Right now I'm running B20, with 15 extra gallons sitting in the garage, in case I run low before heading back up towards Austin where I can pick up more.

Sulfur a problem, yeah whatever. Want to talk about problems...try driving behind any carburated car that is still on the road, particulary an older vehicle that hasn't received much love...now there's the problem!