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P0148 - Fuel Delivery Error

WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
P0148 - FUEL DELIVERY ERROR

Description:  Bank 1 is lean at wide open throttle (WOT).
Possible Causes: 
  • Severely restricted fuel filter
  • Severely restricted fuel supply line
Diagnostic Aids:  Apply 21 kPa (3 PSI) to 34 kPa (5 PSI) air pressure to the fuel line. Air should flow freely through the line. Refer to the fuel system WARNING and CAUTION information at the beginning of pinpoint test HC. refer to PINPOINT TEST HC .
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All   - - refer to PINPOINT TEST HC .