HC: Fuel Delivery System HC: Introduction — 2016 workshop reference 5143

Vehicle applicability: This diagnostic supplement covers multiple Ford vehicles and engines. Follow the application named in the source below. Some references apply to vehicles other than Mustang.

For all others, INSTALL a new Fuel Pressure Sensor. REFER to the fuel system WARNING information at the beginning of this pinpoint test. REFER to the Workshop Manual Section 310-01, Fuel Tank and Lines.

Clear the PCM DTCs. REPEAT the self-test.

HC14 MONITOR THE FUEL PRESSURE WHILE ROAD TESTING THE VEHICLE

WARNING: STRICT OBSERVANCE OF POSTED SPEED LIMITS AND ATTENTION TO DRIVING CONDITIONS ARE MANDATORY WHEN CARRYING OUT THE ROAD TEST. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN PERSONAL INJURY.

Note: Some concerns may only be present during certain fuel level conditions. Determine the fuel level at the time of the concern. Access the information from the customer information worksheet and the customer.

• Ignition OFF.

• Securely route the mechanical gauge so that the gauge is viewable while road testing the vehicle.

• Ignition ON, engine running.

• Engine at normal operating temperature.

• Monitor the mechanical gauge.

• From a stop, accelerate to 89 km/h (55 mph) at full throttle. Repeat this 3 times.

Is the fuel pressure always greater than 352 kPa (51 psi)?

Yes	No
For misfire DTC diagnosis, GO to HD11 . For DTCs P0171, P0174, P2195 or P2197, GO to H22 . For the fuel pressure leakdown concern, INSTALL a new FP. REFER to the Workshop Manual Section 310-01, Fuel Tank and Lines. For all others, RETURN to Section 3, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index for further direction.	GO to HC15 .

Yes

For misfire DTC diagnosis, GO to HD11 .

For DTCs P0171, P0174, P2195 or P2197, GO to H22 .

For the fuel pressure leakdown concern, INSTALL a new FP. REFER to the Workshop Manual Section 310-01, Fuel Tank and Lines.

For all others, RETURN to Section 3, No Diagnostic Trouble Codes (DTCs) Present Symptom Chart Index for further direction.

GO to HC15 .

HC15 CHECK THE FUEL SUPPLY LINE FOR RESTRICTION

Note: Observe the Warnings, Cautions, and Notes.

• Ignition OFF.

• Disconnect the fuel supply line at the fuel rail.

• Disconnect the fuel supply line at the fuel pump.

• Check the fuel supply line for restriction.

• Apply 21 to 34 kPa (3 to 5 psi) air pressure to the fuel supply line.

Does air flow freely through the line?

Yes	No
For Mustang 5.2L, INSTALL a new Fuel Filter assembly. REFER to the Workshop Manual

Source reference 5143

2016 Mustang workshop publication supplied to Mustang Atlas. Original technical text and illustrations; HTML formatting by Mustang Atlas. Source page numbering is retained for traceability. Follow the configuration, revision, warnings, and cross-references in the material. About this edition.