Fuel Delivery System
WARNING:
High-pressure fuel lines deliver fuel under extreme pressure from the injection pump to the injectors. This maybe as high as 1600 bar (23, 206 psi). Use extreme caution when inspecting for high-pressure fuel leaks. Fuel under this amount of pressure can penetrate skin causing serious or fatal injury. Inspect high-pressure fuel leaks with a sheet of cardboard. Wear safety goggles and adequate protective clothing when servicing fuel system.
| CONDITION | POSSIBLE CAUSES | CORRECTION |
|---|---|---|
| No Start/Hard Start/Start and Stall | 1. Contaminated Fuel | 1. Drain, Flush and Refill Fuel System |
| 2. Low Fuel Pressure Supply to Fuel Filter | 2. Perform the Low Pressure Fuel Pump Test to check the fuel pump pressure of the in-tank electric fuel pump. Refer to FUEL DELIVERY - STANDARD PROCEDURE . | |
| 3. High Pressure Fuel Injection Pump | 3. Perform the Fuel Injection Pump Pressure Test / Replace necessary fuel line(s) | |
| 4. Restricted Fuel Filter | 4. Replace Fuel Filter | |
| 5. Fuel Heater Inoperative | 5. Test Fuel Heater and circuitry | |
| 6. Restricted or Leaking Fuel Lines | 6. Inspect / Replace necessary fuel line(s) | |
| 7. Stored Diagnostic Trouble Codes | 7. Refer to the appropriate Diagnostic Information | |
| Stalls Under Aggressive Maneuvers/Loss Of Fuel Pressure | 1. Restricted or Damaged Fuel Pump Lower Filter | 1. Test Fuel Pump Pressure |
| 2. Contaminated Fuel | 2. Drain, Flush and Refill Fuel System | |
| 3. Damaged Fuel Tank | 3. Replace Fuel Tank | |
| 4. Restricted Fuel Filter | 4. Replace Fuel Filter | |
| Cannot Refill Fuel Tank/Excessive Pressure in Fuel Tank When Cap Is Removed | 1. Sticking or Damaged Fuel Tank Fill/Vent Valve | 1. Replace Fuel Tank |
| 2. Restricted or Damaged Fuel Tank Fill/Vent Valve Filter or Hose | 2. Replace Fuel Tank Vent Filter |