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You definitely want to have a fuel filter even if you filter it like crazy before it gets in the truck. You never know what little floaty's the oil will pick up in your tank etc.
And you definitely want to have a fuel filter dedicated to your WVO side Otherwise purging your system will take forever and waste a lot of fuel. You can buy a heated filter housing or wrap the heater hose going to your Hose-in-hose around the filter 3-4 times. If you don't heat the filter, thats a big pile of cold WVO to try and get moving when its time to switch over to veggie.
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