Fuel Pump: Description and Operation

Construction
^ The vertical configuration fuel tank is constructed of sheet metal and incorporates an internal reservoir in which the fuel pump and fuel level sensor rest. This design enhances fuel pump operation during extreme vehicle maneuvers and on steep grades with low fuel levels.

Operation
^ The fuel system uses a high-pressure, in-tank mounted electric fuel pump.

^ The high-pressure fuel pump can supply 60.0 liters (15.9 gal) of fuel per hour, at a working pressure of 269.0 kPa (39 psi and 13.2V).

^ The fuel pump has an internal relief valve to provide overpressure protection if fuel flow becomes restricted (clogged fuel filter, damaged fuel tube, etc.).

^ Overpressure is limited to 850 kPa (123 psi) and fuel flow will be reduced if pressure relief valve is actuated.

^ The fuel pump is protected at its inlet by a nylon pick-up screen that filters out dirt and other contaminants which could plug or damage internal fuel pump components. The filter also allows water in the fuel tank reservoir to flow out.

^ The electrical system has a fuel pump control relay controlled by the powertrain control module (PCM) which provides power to the fuel pump through a normally closed Inertia Fuel Shutoff switch (IFS).