Fuel Pump
Electric fuel pump is located in fuel tank. Fuel pump receives power when ECM provides ground to control relay. When power is supplied to fuel pump, motor and impeller inside pump turn. This causes a pressure difference to occur between both sides of impeller. When fuel is drawn through fuel pump inlet port, pressure is increased and discharged through outlet port. The fuel pump also incorporates a relief valve to prevent excessive rise of discharge pressure and check valve to keep residual pressure in fuel feed line when fuel pump is not activated.