Fuel
Fuel Rail
The fuel rail distributes pressurized fuel to all the injectors.
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Fuel delivery flow
Interactive — tap a partTap a part to see how it fits in the system.
What it does
- Distributes fuel evenly to the injectors
- Holds the fuel pressure sensor and regulator
- Damps pressure pulses
When it fails
- Fuel smell in the engine bay
- Fuel pressure below spec
- Leak at an injector seal
- Lean or rich codes
How to diagnose
- Pressure-test the rail
- Look for wet injector seals
- Check the pressure sensor
- Inspect the damper
Maintenance
- Replace leaking seals promptly
- Use the correct rail torque
Use the diagnosis order. When a part fails, confirm each hypothesis with measurements before replacing anything — codes and symptoms overlap.
Related part
Fuel Injector
Fuel injectors spray a fine, precisely metered mist of fuel into the intake or directly into the cylinder.