Possible Causes:
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Ford RV Cutaway, 2006 Ford Pickup, 2006 Ford F550 Super Duty, 2006 Ford F450 Super Duty, and 2006 Ford Econoline. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Air can enter the fuel system at any point where there is suction in the fuel system.
- Fuel pickup in the fuel tank.
- Fuel supply line entering the fuel module from the fuel tank.
- Fuel return line entering the fuel module from the engine.