Diagnostic Test

CHECK THE LOW PRESSURE FUEL SYSTEM PRESSURE WITH THE SCAN TOOL
NOTE:
Diagnose any Fuel Pump Relay or Fuel Pump Control Module DTCs before continuing with this procedure.
1. Turn the ignition on.
2. Using the scan tool, monitor the Low Pressure fuel system desired pressure and actual pressure readings.
  NOTE:
  The fuel pressure specification can vary depending on several variables including engine load, temperature, etc.
3. Start the engine or crank the engine to allow the Fuel Pump to be commanded on.
  Choose a conclusion that best matches your fuel pressure reading.
  
  The actual pressure is below the desired pressure
  - Go To 2
  The actual pressure matches the desired pressure
  - If directed here by another test, return to that test. Otherwise, test complete.
  The actual pressure is above the desired pressure
  - Go To 3
CHECK THE FUEL DELIVERY SYSTEM FOR LEAKS AND DAMAGE
1. Turn the ignition off.
2. Visually inspect the low pressure fuel delivery system lines and connections for signs of damage or external leaks between the Fuel Tank and High Pressure Fuel Pump Assembly.
  Is the low pressure system leaking or damaged?
  
  Yes
  - Repair or replace as necessary.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST 1.3L or POWERTRAIN VERIFICATION TEST 2.4L .
  No
  - Go To 3
INSTALL APPROPRIATE FUEL LINE ADAPTERS/FITTING FROM THE GAS AND DIESEL FUEL PRESSURE/DECAY TESTER 8978A TO THE LOW PRESSURE FUEL LINE

Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
  NOTE:
  Do not attempt to open the High Pressure side of the fuel system. This procedure is checking the Low Pressure side of the system. The high pressure in the Fuel Rail does not bleed off when the ignition is turned off.
  
  WARNING:
  The fuel system is under a constant pressure (even with the engine off). Before testing or servicing any fuel system hose, fitting, or line, the fuel system pressure must be released. Failure to follow these instructions can result in possible serious or fatal injury.
2. Release the pressure in the low pressure side of the fuel system or FUEL SYSTEM PRESSURE RELEASE 1.3L or FUEL SYSTEM PRESSURE RELEASE 2.4L .
3. Disconnect the Front Fuel Delivery Line connector from the High Pressure Fuel Pump or at the Fuel Pump Assembly in the Fuel Tank.
4. Install the appropriate Fuel Line Adapters/Fitting from the Gas and Diesel Fuel Pressure/Decay Tester (Special Tool No. 8978A, Decay Tool, Fuel).
  Proceed
  - Go To 4
INSTALL THE FUEL PRESSURE GAUGE ASSEMBLY

Courtesy of CHRYSLER GROUP, LLC
1. Connect the (Special Tool No. 8978A, Decay Tool, Fuel), with the Fuel Inlet Hose (1) toward the Fuel tank side and the Fuel Outlet Hose (2) toward the fuel rail side of the system using the Fuel Line Adapters/Fitting as needed.
2. Connect special tool Drain Extension Hose 535680 (3) to the Fuel Pressure Gauge Assembly Drain Hose (5).
3. Connect Reservoir Assembly 534960 (4) to Drain Extension Hose 535680 (3).
  WARNING:
  To reduce the risk of fire and possible serious or fatal injury, place Reservoir Assembly 534960 (4) on the floor and out of the way so that it is not a trip hazard.
  
  Proceed
  - Go To 5
CHECK THE LOW FUEL PRESSURE
1. Turn the ignition on.
2. Using the scan tool, monitor the Low Pressure Fuel System desired pressure on the scan tool.
  NOTE:
  The fuel pressure specification can vary depending on several variables including engine load, temperature, etc.
3. Start the engine or crank the engine to allow the Fuel Pump to be commanded on.
  NOTE:
  Make sure to purge all air from the supply line. It may be necessary to cycle the ignition off and on a couple times.
4. Read the Fuel Pressure Gauge and compare to the desired Low Pressure Fuel System reading on the scan tool.
  Choose a conclusion that best matches your fuel pressure reading.
  
  The actual pressure reading on the Fuel Gauge is below the desired pressure
  - Go To 6
  The actual pressure reading on the Fuel Gauge matches the desired pressure
  - If directed here by another test, return to that test. Otherwise, test complete.
  The actual pressure reading on the Fuel Gauge is above the desired pressure
  - Replace the Fuel Pump Assembly.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST 1.3L or POWERTRAIN VERIFICATION TEST 2.4L .
    CAUTION:
    Stop all actuation tests before proceeding.
CHECK FOR RESTRICTED FUEL SUPPLY LINE
1. Turn the ignition off.
2. Release the pressure in the low pressure side of the fuel system or FUEL SYSTEM PRESSURE RELEASE 1.3L or FUEL SYSTEM PRESSURE RELEASE 2.4L .
3. Disconnect the Fuel Pressure Gauge.
4. Raise the vehicle on a hoist, and remove the Low Fuel Pressure Line from the vehicle.
5. Check the line for any signs of being pinched or restricted.
  Does the Low Fuel Pressure Line show signs of a restriction?
  
  Yes
  - Repair/replace the Low Fuel Pressure Line.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST 1.3L or POWERTRAIN VERIFICATION TEST 2.4L .
  No
  - Go To 7
CHECKING FUEL PUMP INLET STRAINER
1. Turn the ignition off.
2. Remove the Fuel Pump Assembly from the Fuel Tank and inspect the Fuel Inlet Strainer.
  Is the Fuel Inlet Strainer plugged?
  
  Yes
  - Replace the Fuel Pump Inlet Strainer.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST 1.3L or POWERTRAIN VERIFICATION TEST 2.4L .
  No
  - Replace the Fuel Pump Assembly in accordance with the Service Information.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST 1.3L or POWERTRAIN VERIFICATION TEST 2.4L .