I've converted numerous vehicles to/from grease. There are a lot of different ways to run on grease, so it's hard to answer without knowing more details. In all but the worst conversions, the veg oil gets heated before being injected, and you usually want to make sure that doesn't happen to the diesel. If it's being heated by electric elements, make sure those are disconnected electrically. If it's being heated with a hose-in-hose, hose-on-hose, and/or tank heater, you'll want to shut off the coolant supply to those.


The bottom line is that it's pretty simple to go from grease to diesel, but the details depend on your specific setup.


I agree with the previous posters who mentioned carrying spare filters and being prepared for several filter changes after the changeover.



I'd be curious to hear about your setup. Single tank or multi-tank? If multi-tank, what changeover valves were used and how were they controlled? What heating methods were used? Etc.