Fuel Pump Electrical Circuit

When the ignition switch is turned to the ON position, the PCM energizes the fuel pump relay for 2 seconds allowing the fuel pump to pressurize the fuel system. If the PCM does not receive any ignition reference pulses (engine cranking or running) within 2 seconds, the PCM de-energizes the fuel pump relay, this causes the fuel pump to stop.
An inoperative fuel pump relay can result in long cranking times.