This is to those that say it's madness to use the fuel from the old filter to prime the new one. The fuel in the old filter isn't fuel that has been sitting there the past 5 years since you last changed the filter, it's fuel that just came from the tank. As for buying a gallon can for diesel and filling up the new filter with it and pouring the rest in the tank--well thats just silly, the diesel you pour into the new filter from the can and then pour into the tank is the same quality unfiltered fuel that is in the old filter to begin with!