* Engine variations: The 5.4L engine had multiple variations in 2004. Each variation could have different fuel pressure requirements.
* Fuel system type: The fuel system setup (e.g., fuel injectors, fuel pump, regulator) can influence the desired pressure.
* Engine conditions: Fuel pressure can change with engine temperature, fuel quality, and other factors.
How to find the correct fuel pressure for your vehicle:
1. Consult your owner's manual: Your owner's manual should have a section on specifications, including fuel pressure.
2. Check online resources: Websites like Ford's official website, repair manuals, or automotive forums may have this information.
3. Contact a mechanic: A qualified mechanic can look up the correct fuel pressure for your specific vehicle using diagnostic tools.
Remember: It's important to consult reliable sources for accurate fuel pressure specifications. Using incorrect information can lead to engine problems.
