310-00A Fuel System - General Information - 1.6L Duratec-16V Ti-VCT (88kW/120PS) - Sigma 2014 Fiesta
Diagnosis and Testing Procedure revision date: 03/26/2013

Fuel System

Symptom Chart(s)

Symptom Chart

Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices.
REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).

NOTE: The following procedure diagnoses a slow to fill concern only. For all other concerns, refer to Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Symptom Possible Sources Action
  • Slow to fill
  • Fuel tank filler pipe
  • Fuel tank filler pipe vent tube, if equipped
  • Evaporative Emission (EVAP) system
  • Fuel tank inlet check valve (part of the fuel tank)
  • Fuel level vent valve (part of the fuel tank)
  • All other fuel system concerns
  • Fuel system components
  • Refer to Powertrain Control/Emissions Diagnosis (PC/ED) manual.

Diagnostic Routine(s)

Slow to Fill

Normal Operation and Fault Conditions

Under normal operation, fuel should flow at a steady rate through the fuel tank filler pipe into the fuel tank. As fuel enters the fuel tank air is vented through the filler pipe or the ORVR system.


PINPOINT TEST A : SLOW TO FILL
A1   CHECK COMPONENTS FOR SIGNS OF DAMAGE
  • Visually inspect the following components for signs of damage:
    • Fuel tank filler pipe
    • Fuel tank filler pipe vent tube, if equipped
    • EVAP system
    • Fuel tank inlet check valve (part of the fuel tank)
    • Fuel level vent valve (part of the fuel tank)

Was the cause of the concern found?

Yes REPAIR or INSTALL new components to correct the concern.
No GO to A2


A2   CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION
  • Remove the fuel tank filler pipe assembly.
    REFER to: Fuel Tank Filler Pipe (310-01A Fuel Tank and Lines - 1.6L Duratec-16V Ti-VCT (88kW/120PS) - Sigma, Removal and Installation).
  • Inspect the fuel tank filler pipe and fuel tank filler pipe vent tube (if equipped) for a blockage or restriction.

Is the fuel tank filler pipe or fuel tank filler pipe vent tube (if equipped) blocked or restricted?

Yes If possible, REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL a new fuel tank filler pipe or fuel tank filler pipe vent tube.
No GO to A3


A3   CHECK THE FUEL TANK INLET CHECK VALVE
  • Inspect the fuel tank inlet check valve for restriction or sticking.

Is the fuel tank filler pipe inlet check valve restricted or sticking?

Yes If possible, REPAIR the restriction. If the restriction cannot be repaired, INSTALL a new fuel tank.
REFER to: Fuel Tank (310-01A Fuel Tank and Lines - 1.6L Duratec-16V Ti-VCT (88kW/120PS) - Sigma, Removal and Installation).
No INSTALL a new fuel tank.





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