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A big issue that many Fox Body Mustang owners have is finding their Fox Body fuel pump relay locations. It is good to know that depending on the year, the fuel pump relay will be located in different areas. So, we at LMR have provided a quick location guide. This will consist of the different locations and the year models that are associated with them!
Fox Body w/ 5.0 Engines![]()
1986-91 Fox Body Mustangs
For 1986-91 Mustang year models, the Fuel Pump relay location is located under the driver's seat area. This tends to be the usual location across the board. So, placement of this relay doesn’t get more in-depth until you get to the 1992-93 year models. Check out our 86-91 fuel pump relay for sale!
1992-93 Fox Body Mustangs
For 1992-93 Mustang year models, the location for the fuel pump tends to be located under the MAF (Mass Air Flow). In some cases, we have heard that some of the earlier 92’ Mustang year models can still have them under the driver seat. So, we advise you to check both spots just to make 100% sure. For example, if your car has 2 relays near the MAF sensor instead of just 1 then you most likely have the later 92’-year model.
Fox Body With 2.3L Engines
Integrated Relay Control Module (IRCM) Overview
Purpose
The Integrated Relay Control Module (IRCM) serves as a critical interface between the Electronic Control Assembly (ECA) and several key vehicle components, including the cooling fan, A/C clutch, and fuel pump. It also houses the Electronic Engine Control (EEC) power relay, which supplies power to the ECA, ensuring seamless operation.
By consolidating multiple relays into a single module, the IRCM enhances reliability, extends service life, and reduces the complexity of the vehicle’s wiring system.
Construction
Designed with efficiency in mind, the IRCM features a single 24-pin connector. The relays inside the unit function independently, despite being housed within the same module.
Operation
The relays within the IRCM work together to manage various vehicle functions. Below is an overview of the individual relay functions:
EEC Power Relay
This relay is essential for activating other circuits within the IRCM. Without it, none of the other components can operate. This ensures that actuators remain off unless the EEC system has full control over them.
Fuel Pump Relay
This relay is responsible for managing the fuel pump’s operation. The ECA provides the grounding for the primary side of the relay, while the secondary side delivers Battery Voltage (B+) directly to the fuel pump.
Electro-Drive Fan Relay
The Electro-Drive Fan (EDF) relay regulates the electric cooling fan. Under normal conditions, the primary control circuit remains at B+, allowing the low-speed cooling fan to run continuously. When the ECA grounds the circuit, it lowers the voltage, turning the fan off. This built-in fail-safe ensures the fan remains operational whenever the EEC power relay is engaged—even in the event of an ECA failure.
Wide Open Throttle (WOT) A/C Control Relay
This relay controls the A/C compressor clutch during regular operation and disengages the clutch during Wide Open Throttle (WOT) conditions as directed by the ECA. It features two control circuits—one for engaging the A/C clutch based on user input and the A/C cycling pressure switch, and another for disengaging the clutch when commanded by the ECA.
Power Ground
A dedicated grounding circuit ensures the IRCM has a stable ground connection for proper functionality. This circuit connects directly to the vehicle’s battery negative terminal.
The IRCM’s integrated design provides efficient and dependable operation, ensuring essential vehicle systems function properly under all driving conditions.
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We hope that this short, but informative article listing the different Fox Body Fuel Pump Relay Locations makes life a little easier for you!
