• Ken Freund Posted: 4/25/2011 11:05am PDT

    This idea that your fuel system will only pick up "sediment or sludge" when the tank is low is mostly a misconception. That's because the fuel pickup in the tank is in a fixed position. It always picks up from the same place low in the tank. If it was a floating pickup this story would be more true. Also, in the last paragraph it talks about the computer having to adapt. It takes many reading per second from the oxygen sensors and constantly adjusts the fuel mixture based on this info anyway. That said, running with the tank mostly empty promotes the formation of condensation, which is the most common source of crud in the tank.