From what I've read/heard, there is no problem with WVO affecting natural rubber fuel hoses and seals. I understand that trace amounts of methanol found in biodiesel degrade natural rubber over time. Many have run biodiesel in vehicles with natural rubber for a long time without seeing any leaking. Others change the hoses/seals prior to use just to be sure.

I hope to use WVO as much as possible and use biodiesel when its too cold to use the WVO.

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1983 300td 240k (down with bad tranny)
1984 300d 222k (daily driver) "Olive"
1997 GMC K2500 105k (sled dog limo)

"The scenery in ANWR is as spectacular as the Grand Canyon and the wildlife is more impressive."