I had read a bit here and there about Pollack valve failure and have now had the experience. I now have a little over 25K miles on wvo in my 190D daily driver, and all has been seamless and grief free (haven't even had to change the wvo filter yet).

Went on a short (165 mile ea way) trip to drown some worms in Lake Champlain iast week. Mpg seemed pretty terrible but I was towing my little fishing boat, which I had, until now, only done locally. Almost home (300 miles or so) I ran out of wvo. Flipped the switch to dino and motored on home.

When I switched over to dino it seemed as though there was more than I had remembered there being in the dino tank. When I got home and smelled the exhaust the problem became apparent. The return side of the pollack had failed, sending the veg return into the dino tank, thus what appeared to be really poor mileage.

On the way out weather was hot (for this neck of the woods) 85+/- and there were some long grades where the engine (and veg) temp had hit 100c. Must have been more than the Pollack could handle. Frybrid ss solonoid valves are on order.

Might be something to consider if you are setting up a wvo system.

Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)

Here's another thought. Use only 6-port switches for dual tanks to prevent this occurance.

The Pollack is a six way, although it is motorized, (was supposed to be the best option at the time I bought it) but apparently it can't take the heat, at least mine couldn't.

Jim

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2005 C240 4matic wagon (daily driver)
87 190D - 225K (on loan)
85 190D - 312K (on loan)
2011 Subaru Legacy AWD (Wife's)

Mine lasted 20K miles...the supply would let diesel in w/ the veggie.
I got greasecar valves...a bit cheaper than frybrids... frybrid has good products but will only ship and respond to customers Qs when they feel like it.

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82 300D....went to MB heaven
90 350 SDL....excercising con rods

mine lasted 300 miles.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine