Join Date: Nov 1999
Location: Central California, USA
Generally it indicates there was a loss of fuel pump voltage while the engine was running.
If the fuel pump voltage is below 2 volts for over 1.5 seconds while the ecm is recieving ignition module pulses. It sets the code.
If the fuel pump relay goes bad, you will have extended engine cranking until the engine until oil pressure is high enough to close the oil pressure switch that sends voltage to the fuel pump.
The relay is mainly there to supply voltage to the fuel pump until the engine starts.
The older I get, the faster I was!