Signs of a fuel pump failure include the engine not starting, a sudden reduction in fuel economy and noticeable jerking or sputtering when accelerating or driving at high speeds. An engine that sounds as if it is about to turn over but does not catch may indicate fuel pump failure.
A fuel pump must maintain a steady pressure to deliver the correct amount of fuel to the engine. A failing fuel pump can deliver too much fuel, which causes a sudden reduction in fuel economy. This symptom may be accompanied by the engine revving too high or idling roughly. Conversely, if the pump delivers too little fuel to the engine or fails to do so at a constant pressure, the vehicle may stall or sputter when starting or driving at high speeds or may even surge forward as if pressing on the gas pedal due to the inconsistency in pressure.