Pinpoint Test HC: Fuel Delivery System: Introduction: Notes

NOTE: This pinpoint test is intended to diagnose the following:

Chassis Components.
Engine Vacuum.
Fuel Pressure.
Fuel Supply Line.
Fuel Supply.
Fuel Injector. (9F593).

NOTE: For fuel pressure specifications using a manual gauge, see FUEL PRESSURE SPECIFICATIONS .

Fuel System Specification Chart

Application

Engine

Fuel System Type

FRP PID Fuel Pressure (kPa)

FRP PID Fuel Pressure (psi)

CARS:

Focus

2.0L 2V SPI

ERFS ⁽³⁾

240-448

35-65

Focus

2.0L 4V ZETEC

ERFS ⁽³⁾

240-448

35-65

Focus

2.0L 4V HO SVT

ERFS ⁽³⁾

240-485

35-70

Focus

2.3L PZEV

ERFS ⁽³⁾

240-448

35-65

Taurus

3.0L 2V FFV

ERFS ⁽³⁾

210-450

30-65

Taurus/Sable

3.0L 2V

ERFS ⁽³⁾

270-450

39-65

Taurus/Sable

3.0L 4V

ERFS ⁽³⁾

270-380

39-55

Lincoln LS

3.0L

ERFS ⁽³⁾

270-380

39-55

Mustang

3.9L

ERFS ⁽³⁾

240-380

35-55

Freestar

3.9L

ERFS ⁽³⁾

275-485

40-70

Freestar/Monterey

4.2L

ERFS ⁽³⁾

275-485

40-70

Lincoln LS/Thunderbird

3.9L

ERFS ⁽³⁾

270-450

39-65

Crown Victoria/Grand Marquis/Town Car

4.6L

ERFS ⁽³⁾

275-485

40-70

Crown Victoria

4.6L NGV

NGV ⁽⁴⁾

550-825

80-120

Mustang GT

4.6L 2V

ERFS ⁽³⁾

275-485

40-70

Mustang Mach 1/Cobra

4.6L 4V

ERFS ⁽³⁾

205-380

30-55

Marauder

4.6L 4V

ERFS ⁽³⁾

275-485

40-70

TRUCKS:

Escape

2.0L 4V

MRFS ⁽²⁾

Ranger

2.3L

MRFS ⁽²⁾

Escape

3.0L 4V

MRFS ⁽²⁾

Explorer Sport

4.0L SOHC

ERFS ⁽³⁾

275-485

40-70

Ranger

3.0L

MRFS ⁽²⁾

Ranger

3.0L FFV

MRFS ⁽²⁾

Ranger

4.0L SOHC

MRFS ⁽²⁾

E/F -Series

4.2L

RFS ⁽¹⁾

Aviator

4.6L 4V

ERFS ⁽³⁾

275-485

40-70

Explorer/Mountaineer

4.0L SOHC

ERFS ⁽³⁾

345-485

50-70

Explorer/Mountaineer

4.6L

ERFS ⁽³⁾

345-485

50-70

E/F -Series

4.6L

ERFS ⁽³⁾

275-485

40-70

F-Series

5.4L 3V

ERFS ⁽³⁾

275-485

40-70

E-Series

5.4L 2V

ERFS ⁽³⁾

240-485

35-70

E-Series/F-Series Heritage

4.6L

RFS ⁽¹⁾

Expedition

4.6L

MRFS ⁽²⁾

E/F-Series/Excursion

5.4L 2V

MRFS ⁽²⁾

Expedition

5.4L 2V

MRFS ⁽²⁾

E/F -Series

5.4L NGV

NGV ⁽⁴⁾

550-825

80-120

F-Series Lightning

5.4L SC

RFS ⁽¹⁾

Navigator

5.4L 4V

MRFS ⁽²⁾

E/F-Series/Excursion

6.8L

ERFS ⁽³⁾

275-485

40-70

Fuel System Type Definitions:

⁽¹⁾

Return Fuel System: This type of fuel delivery system returns excess fuel to the fuel tank by means of a fuel return line from the fuel rail. Fuel pressure is controlled by a mechanical pressure regulator located on the fuel rail. Vehicles equipped with RFS do not use a fuel rail pressure (FRP) sensor.

⁽²⁾

Mechanical Returnless Fuel System (MRFS): This type of fuel delivery system does not return fuel to the fuel tank by means of a return line. Fuel pressure is controlled by a mechanical pressure regulator located on the fuel pump module in the fuel tank. Vehicles equipped with MRFS do not use a fuel rail pressure (FRP) sensor.

⁽³⁾

Electronic Returnless Fuel System (ERFS): This type of fuel delivery system does not return fuel to the fuel tank by means of a return line. This system does not incorporate a mechanical pressure regulator. Pressure is controlled by continuously varying the fuel pump speed through the fuel pump driver module (FPDM). All vehicles equipped with ERFS use a fuel rail pressure (FRP) sensor.

⁽⁴⁾

Natural Gas Fuel System (NGV): This type of fuel system does not return fuel to the fuel tanks. Pressure in the fuel tanks acts as the "fuel pump". Line pressure is controlled by a mechanical pressure regulator located upstream of the fuel tanks. All NGVs use a fuel rail pressure (FRP) sensor. The FRP sensor is also commonly referred to as an Injection Pressure Sensor (IPS).

NOTE: Replacement fuel injectors may not be the same color as the injectors in the vehicle. Verify the replacement injector is correct for the application by part number.

WARNING: THE FUEL SYSTEM REMAINS UNDER PRESSURE AFTER THE ENGINE IS OFF. RELIEVE PRESSURE BEFORE SERVICING. HIGHLY FLAMMABLE MIXTURES PRESENT. TO RELEASE PRESSURE FROM THE FUEL SYSTEM, PERFORM THE FOLLOWING:

CONNECT A ROTUNDA FUEL PRESSURE GAUGE 134R0087 OR EQUIVALENT .
GRADUALLY OPEN THE TESTING KIT VALVE TO RELIEVE THE FUEL PRESSURE IN THE VEHICLE FUEL SYSTEM AND DRAIN THE FUEL INTO A SUITABLE CONTAINER OR RETURN IT TO THE FUEL TANK .
TO AVOID UNNECESSARY FUEL SPILLAGE AND FIRE HAZARD, ANY TIME FUEL LINES ARE DISCONNECTED, THE IGNITION SWITCH MUST BE IN THE OFF POSITION UNLESS FUEL PUMP OPERATION IS REQUIRED FOR TEST PURPOSES .

CAUTION: Use care to prevent combustion from fuel spillage. No smoking, open flames, or any kind of arcing.