The fuel tank pressure sensor on a 2004 Ford Expedition is typically mounted as part of the EVAP system on or near the evaporative canister. In most configurations you’ll find it on the EVAP canister in the engine bay (often on the passenger side) or, in some layouts, integrated with the fuel tank module itself. Look for a small sensor with an electrical connector and a vacuum hose attached to the canister or tank area.
Understanding the fuel tank pressure sensor and its role
The fuel tank pressure sensor (FTPS) monitors pressure in the fuel tank to help the engine control module manage fuel vapor emissions. It works along with the EVAP canister, purge valve, and associated hoses to control vapor flow and fuel vapor recovery. If the sensor or its wiring fails, it can trigger EVAP-related diagnostic trouble codes and affect fuel vapor management.
Because Ford used a few EVAP layouts over the years, exact mounting can vary by VIN and engine. If you can’t locate the sensor in the most common spots, consult the vehicle’s service manual or a Ford dealer for the precise mounting point on your truck.
Common mounting locations for the FTPS in the 2004 Expedition are described below. Use the list to narrow down where to look in your specific vehicle.
- On the evaporative canister (EVAP canister): The FTPS is often mounted directly to the canister or its housing, which is typically found in the engine bay on the passenger side or near the rear of the vehicle by the fuel tank. The sensor will have a small connector and a vacuum line attached.
- On or near the fuel tank module: Some configurations place the FTPS on the top of the fuel tank sending unit area, which may require lowering the tank to access. In these setups, the sensor sits close to the tank and is wired to the PCM.
- Integrated with EVAP components: In certain layouts, the sensor may appear as part of the purge valve assembly or a nearby EVAP component, with hoses routing from the canister to the engine bay. Trace EVAP lines from the canister to locate the sensor.
Conclusion: These are the most common locations for the 2004 Expedition, but variations exist by production date and trim. If you’re uncertain or can’t find it, refer to the factory service manual or consult a Ford technician for the exact mounting point on your VIN.
How to locate and verify the FTPS on your vehicle
Before you start, ensure you follow proper safety procedures for working around the fuel system, including disconnecting the battery if you’ll be handling electrical connections and avoiding spark sources around the fuel system.
- Identify the EVAP system components: Locate the charcoal canister and purge valve in the engine bay or near the rear of the vehicle. The FTPS is connected to this network.
- Inspect the canister area: Look for a small sensor with wiring harness and a vacuum hose attached to the canister housing. The sensor will typically have a two- or three-pin electrical connector.
- Check the fuel tank area if not found in the engine bay: If the canister area looks clear, inspect around the fuel tank top or sending unit area (note that some configurations place the FTPS there and may require lowering the tank for access).
- Verify the connector and wiring: Ensure the connector isn’t loose, corroded, or damaged. Check that the vacuum hose is properly connected and not cracked or split.
- Test or inspect under service guidance: If diagnosing faults, use the vehicle’s service information to test the sensor’s resistance or signal to the PCM, and check for EVAP codes with an appropriate scanner.
Testing and verification should be performed with appropriate tools and according to the vehicle’s service manual. If the sensor shows signs of failure or the EVAP system codes persist after inspection, replacement may be necessary.
VIN-specific variations and safety notes
Because Ford used different EVAP layouts across production years, the precise FTPS mounting can vary by VIN and engine code. Always confirm with the factory service manual for your exact truck. When working around the fuel system, take care to avoid ignition sources, relieve fuel pressure safely, and properly reconnect any electrical connectors and hoses after maintenance.
Summary: The FTPS on a 2004 Ford Expedition is generally located on or near the EVAP canister in the engine bay or, in some configurations, on the fuel tank module. Use the EVAP canister as your starting point, trace related hoses, and check the wiring to identify the sensor. If in doubt, consult the service manual for your exact VIN.
In brief: On most 2004 Expeditions, look around the EVAP canister area (engine bay, passenger-side) or the top of the fuel tank module for the FTPS, and verify by inspecting its connector and hoses. If you can’t locate it, seek a VIN-specific manual or dealer guidance.