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This is a view of the Pollack change over valve mounted at the front of the engine bay, just in front of the injector pump. The copper tube assembly is the end of the heat exchanger, the thin 8mm tube containing the Waste Vegetable Oil (WVO) from the second tank. This type of valve is essential to any WVO conversion due to the fact that two seperate fuel tanks are needed. This valve has the added advantage that it can switch between fuel tank contents senders, utilising the vehicles single fuel gauge. I found that there is no easy way to mount this valve as one set of pipes will always be in an awkward position relative to the others.