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Home >> Ford >> 2022 >> Mustang Mach 1 Premium, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 19 (Fuel System - General Information - 5.2L 32V Ti-VCT - Supercharged) >> Diagnosis And Testing >> Fuel System >> Diagnostic Routine(s) >> Pinpoint Test A: Slow To Fill

Pinpoint Test A: Slow To Fill

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  1. Refer to the appropriate Wiring Diagrams for schematic and connector information.

    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.

    Possible Sources 

    • Fuel tank filler pipe
    • Fuel tank filler pipe vent tube, if equipped
    • Evaporative emission system
    • Fuel tank inlet check valve (part of the fuel tank)
    • Fuel level vent valve (part of the fuel tank)

  2. 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

  3. A2 CHECK THE SYSTEM FOR ANY EVAP (EVAPORATIVE EMISSION) DTC'S

    • Connect the scan tool.

    • Check the system for any EVAP DTC's.

    Are any DTC's present? 

    Yes  REFER to: Evaporative Emissions .
    No  GO to  A3

  4. A3 MONITOR THE FTP WHILE FILLING THE FUEL TANK

    • NOTE: During normal fuel fill the Fuel Tank Pressure (FTP) Sensor value starts at 2.6 volts and will increase.3 to.7 of a volt from its starting point.

      Monitor the Fuel Tank Pressure (FTP) reference value while filling the fuel tank.

    Is FTP within specification? 

    Yes  GO to  A5
    No  GO to  A4

  5. A4 MONITOR THE FTP WHILE FILLING THE FUEL TANK WITH THE EVAP SYSTEM DISCONNECTED

    • Disconnect the fuel tank-to-EVAP canister quick connect coupling at the EVAP canister.

    • NOTE: During normal fuel fill the Fuel Tank Pressure (FTP) Sensor value starts at 2.6 volts and will increase.3 to.7 of a volt from its starting point.

      Monitor the FTP reference value while filling the fuel tank.

    Is FTP within specification? 

    Yes  INSPECT the EVAP system for blockage or restrictions. REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL new EVAP system components.
    No  GO to  A5

  6. A5 CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION

    • Remove the fuel tank filler pipe assembly. REFER to: Fuel Tank .

    • 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  A6

  7. A6 CHECK THE FUEL TANK INLET CHECK VALVE

    • Inspect the fuel tank inlet check valve for restriction or sticking.

    Is the fuel tank 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 .
    No  INSTALL a new fuel tank.
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