Agreed that you that it is not a good practice to run your tank dry. I don't see where running it down until the fuel light comes on hurts anything. Gee wiz, think about it- there is typically 5-7 gallons left when the light comes on! I am sure that cooing of the fuel pump will occur with any volume of fuel running through it, because the ambient temperature of the fuel is not affected as the fuel level lowers. The issue of fouling up a fuel system is more related to how long a person runs on reserve and how often they do it, as well as the quality of fuel that they use.titanss said:Those of you that run your truck until the fuel light comes on, you are killing your fuel pump by doing this. The fuel pump likes to push fuel instead of pulling fuel, with it in the tank it is easy to push fuel and work less, also it cuts down on the noise it makes. The fuel pump uses the fuel in the tank as a coolant, running the fuel very low lets the pump heat up and shorting it's life. With a low level in the tank the filter/sock will pick up all of the debris on the bottom and clog up, this is the only filter between the tank and injectors. Unless you like to drop the tank to replace the pump and/or filter prematurely, keep at least 1/4 tank of fuel so the pump will stay cool and live a long and happy life.