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Near every fuel tank for a dual-fuel diesel system must run a water separator for obvious reasons. And speaking of filtration devices, you might be wondering how you acquire veggy oil to put in your tank, short of going to the grocery store and stocking up. Well, VPS has a system called Veg 'N Go that allows you to pull up to the back of your local Chinese take-out or burger joint and pump out their used fryer oil (with their permission, of course). The Veg 'N Go pumps the crude into a holding tank, at the same time filtering out contaminants like French fries.