I like the porche fans. I put an extra electric cooling fan from a subaru on my rabbit. The reason was because I want to put 5 gallon SVO tank in the engine compartment, where the battery usually goes. The battery went over to the passenger side, where the air cleaner box used to be when it had the gas engine. If I switch to the subaru fan, instead of the VW one with the big motor sticking out, I have room for the WVO tank to stick out above the tranny a bit. Anyone got ideas on that?
On filter clogging, I pre-emtively changed the filter on my truck about 2 months after switching to B100, and then last week (3 months on the new filter), I clogged the new filter. It would idle, but no more. Combination of driving around in 20 degree weather using B100, and rust particles. Always keep a spare filter with you.
I'm considering putting in a cheap cartrige filter upstream of the stock filter, so it'll clog up every few months, before the $29 mitsubishi filter clogs up. I suspect I have rust in the tank that the biodiesel is cleaning out. I haven't replaced any lines on the truck yet -- no leakage yet, but I keep checking.
I've got a friend who has done two vehicals on SVO, and he strongly recommends against using SVO in the OEM tank (after doing it on one of them). Because it is probably rusty after 20 years, and heated SVO will pick this up more, plus if you don't dewater your SVO, it'll rust worse. We're currently in the process of putting SVO systems on my truck, my rabbit, and his VW caddy, and we're considering marine fuel tanks (made of cross linked polyethylene which should withstand the temperature of being heated).