Abstract: A motor vehicle fuel sender including a container in a fuel tank of the vehicle having a horizontal partition separating a first chamber above the partition from a second chamber below the partition, a one-way valve between the fuel tank and the second chamber permitting only gravity-induced inflow of fuel into the second chamber, a fuel pump having an inlet to the second chamber, a drain port in the horizontal partition, and a float in the second chamber operative to open and close the drain port in accordance with the level of fuel in the second chamber. Return fuel from a motor of the motor vehicle is conducted to the first chamber which is open on top to permit overflow into the fuel tank in a manner which promotes thermal stratification in the fuel tank. The one-way valve is located near the bottom of the fuel tank so that the second chamber is replenished with fuel from only the lowest temperature stratum in the fuel tank.