Fuel Tank: Description and Operation

DESCRIPTION

The plastic fuel tank is mounted to the frame rails under the left/center side of the vehicle. The fuel tank contains a serviceable fuel pump module with an electric fuel pump, and a fuel level sending unit. The tank is also equipped with 2 fuel lines: a fuel supply line to the fuel pump, and a separate fuel return line.

Fuel Temperature Control: A section of the fuel return line is coiled at the rear section of the tank. This coiled section is used to help drop the temperature of fuel returning to the tank. A thermostat (preheating valve) (3) is used to keep fuel temperature below 167 degrees F. If fuel temperature is above 167 degrees F, fuel passes first through the coiled cooler lines, and then into the fuel tank. If fuel temperature is below 150 degrees F, fuel bypasses the coiled cooler lines, and is returned directly into the fuel tank.

An electric fuel pump (more commonly referred to in diesel applications as a fuel transfer pump or fuel lift pump) is attached to the fuel pump module. This module is located in the fuel tank.