Fuel Tank Fuel Pump Module

The electric three-phase style fuel pump attaches to the Fuel Tank Fuel Pump Module inside the fuel tank and supplies fuel through the fuel feed pipe to the high pressure fuel pump. The Fuel Tank Fuel Pump Module contains a reverse flow check valve. The check valve maintains fuel pressure in the fuel feed pipe in order to prevent long cranking times.

The Fuel Tank Fuel Pump Module consists of the following major components:

• The fuel level sensor
• The fuel pump and reservoir assembly
• The fuel strainer
• The pressure relief regulator valve
• The jet pump

Fuel Level Sensor 

The fuel level sensor consists of a float, a wire float arm, and a ceramic resistor card. The position of the float arm indicates the fuel level. The fuel level sensor contains a variable resistor which changes resistance in correspondence with the position of the float arm.

Fuel Pump and Reservoir Assembly 

The fuel pump is mounted in the Fuel Tank Fuel Pump Module reservoir. The fuel pump is a three-phase electric pump. Fuel is pumped to the high pressure fuel pump at a pressure that is based on feedback from the fuel pressure sensor. The fuel pump delivers a constant flow of fuel even during low fuel conditions and aggressive vehicle maneuvers. The fuel pump flex pipe acts to dampen the fuel pulses and noise generated by the fuel pump.

Fuel Strainer 

The fuel strainer attaches to the lower end of the Fuel Tank Fuel Pump Module. The fuel strainer is made of woven plastic. The functions of the fuel strainer are to filter contaminants and to wick fuel. The fuel strainer normally requires no maintenance. Fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or contamination.

Pressure Relief Regulator Valve 

The pressure relief regulator valve replaces the typical fuel pressure regulator used on a mechanical returnless fuel system. The pressure relief regulator valve is closed during normal vehicle operation. The pressure relief regulator valve is used to vent pressure during hot soaks and also functions as a fuel pressure regulator in the event of the Fuel Pump Power Control Module defaulting to 100% Pulse-Width Modulation (PWM) of the fuel pump. Due to variation in the fuel system pressures, the opening pressure for the pressure relief regulator valve is set higher than the pressure that is used on a mechanical returnless fuel system pressure regulator.

Jet Pump 

The jet pump is located in the Fuel Tank Fuel Pump Module. Fuel pump flow loss, caused by vapor expulsion in the pump inlet chamber, is diverted to the jet pump through a restrictive orifice located on the pump cover. The jet pump fills the reservoir of the Fuel Tank Fuel Pump Module.