I have used straight, used ATF as fuel for over 100k miles and have had NO issues with pump, injectors or anything else in a 2000 F350 with a 7.3. Ball bearing turbo, modded IDM, and DP tuner chip. Never run anything less than the 80 hp tune up to 140 hp tune. I run the used fluid thru a 5 micron filter set up and pump it into the tank. Thats it. Not saying its right, but it is what I do. FYI, the truck runs quieter on atf than diesel and I dont notice any power loss. I dont have to worry about fuel gelling ever. This truck gets beat. 10 ft. plow and a salter all year. Now that I said this it will probably grenade at the next snowfall. LOL