Engine cranks a long time before it fires up is sign of a bad check valve in the fuel pump I’ll go through the most common symptoms of a bad fuel pump for fuel injected vehicles. However, newer cars with fuel injection have electric fuel pumps located in the fuel tank and they have different failure symptoms than a mechanical fuel pump. Older cars equipped with carburetors usually have mechanical fuel pumps driven by the camshaft and a follower pin. Symptoms are different between electric and mechanical fuel pumps The point is, perfectly good fuel pumps get replaced because people don’t always know the symptoms of a failing fuel pump or do the proper testing before replacing the pump. If your engine won’t start, takes too much cranking to start or your engine stalls, you may have a bad fuel pump or you may have a fuel pump wiring issue caused by a corroded connection or ground or a bad fuel pump control module. IF YOU CHECK YOUR VEHICLE WITH A SCAN TOOL, THE MOST COMMON BAD FUEL SYSTEM CONTROL MODULE ERROR CODE IS P069E.Repair Topics > Fuel, Fuel pump, Fuel delivery > Symptoms of a bad fuel pump Symptoms of a bad fuel pump What are the symptoms of a bad fuel pump IF NO POWER IS FOUND AT THE POWERTRAIN CONTROL MODULE, REPLACE WITH PROGRAMMED UNIT. IF YOU FIND POWER AT THE POWERTRAIN CONTROL MODULE, LOCATE THE BREAK IN THE WIRE TO REPAIR. AT THE POWERTRAIN CONTROL MODULE, CHECK PIN 50, IN THE BLACK CONNECTOR, FOR 12 VOLTS WITH THE KEY ON, FROM THE DARK GREEN/WHITE WIRE. AFTER COMPLETING THE STEPS ABOVE, IF YOU FIND NO POWER AT THE FUEL SYSTEM CONTROL MODULE, AT THE DARK GREEN/WHITE WIRE, MOVE TO THE POWERTRAIN CONTROL MODULE. wire/PCM integrity pass If any of the three conditions have been satisfied.
*Important Green/white wire conditions*Ĭheck for one of the following three conditions. IF THE POWERTRAIN CONTROL MODULE IS SENDING THE SIGNAL TO COMMAND THE FUEL PUMP ON, THEN THE TEST LIGHT WILL BE ILLUMINATED. WITH A TEST LIGHT CONNECTED TO THAT WIRE, TURN THE KEY TO THE RUN POSITION. NEXT, CHECK FOR FUEL PUMP SIGNAL AT THE FUEL SYSTEM CONTROL MODULE.Ĥ. THIS WILL POWER THE PUMP TO RUN AND CHECK FOR A FAULTY FUEL PUMP.ģ. CONNECT PIN32 (RD/WH BATT + ) TO PIN47 (GY FUEL PUMP 12+) CONNECT PIN1 (BLACK GROUND) TO PIN16 (PINK GROUND)Ģ. PLEASE REFERENCE THE DIAGRAM TO HELP PROPERLY DIAGNOSE A FAULTY FUEL SYSTEM CONTROL MODULE.īEFORE TESTING, ENSURE THAT BOTH FUEL RELATED FUSES HAVE BEEN REPLACED:ġ. YOU WILL ALSO FIND THE PIN OUT DIAGRAM FOR THE FUEL SYSTEM CONTROL MODULE FOUND ON 2007 AND NEWER GM VEHICLES.
AT THE BOTTOM OF THIS PAGE, YOU WILL FIND THE YOUTUBE VIDEO FOR THIS PROCEDURE.
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