You'll most likely find the relevant circuitry within one of these locations:
* Integrated within the Powertrain Control Module (PCM): This is the most common scenario. The PCM is the "brain" of the engine and controls the fuel pump through a relay or transistor within the PCM itself. The PCM location is usually under the hood, but its exact position varies by year and model. Consult a repair manual for your specific vehicle's PCM location.
* Integrated within a separate control module (less likely): In some rare cases, a separate module might control the fuel pump, often near the PCM or under the dash. Again, a repair manual is crucial to determine this.
Do NOT attempt to locate this yourself unless you are experienced working on cars. Misidentifying and tampering with the PCM or other modules can cause significant damage to your vehicle.
To diagnose fuel pump issues: It's generally more effective to start by having a professional mechanic or using an OBD-II scanner to check for diagnostic trouble codes (DTCs) related to the fuel pump or fuel system. This will provide a much more accurate indication of the problem area before attempting to locate any specific module.