Fuel Leak Diagnosis

Fuel Leak Diagnosis

1. Clean all of the fuel lines between the fuel injection pump and the fuel injectors using brake cleaning solvent, and let dry.

2. Add 8 ounces of oil dye to the fuel tank. On dual tanks, add the dye to the front, or primary tank. Refer to Fuel System Description Fuel System Description.

3. Start and idle the engine for 3-5 minutes.

4. Command the fuel pressure control to 180 MPa (26,100 psi) with a scan tool.

5. Inspect for fuel leaks around the fuel injection pump, fuel rails, and fuel injector supply lines with a CH 42220 Universal 12 Volt Leak Detection Lamp.
Tighten or replace any leaking lines or components. Refer to the following:

* Fastener Tightening Specifications Specifications

* Fuel System Description Fuel System Description

* Fuel Feed Pipe Replacement (Chassis) Fuel Feed Pipe Replacement (Chassis)

* Fuel High Pressure Pipe Replacement - Pump to Rail Fuel High Pressure Pipe Replacement - Pump to Rail

* Fuel High Pressure Pipe Replacement - Rail to Rail Fuel High Pressure Pipe Replacement - Rail to Rail

* Fuel Injection Fuel Feed Pipe Replacement - Left Side Fuel Injection Fuel Feed Pipe Replacement - Left Side

* Fuel Injection Fuel Feed Pipe Replacement - Right Side Fuel Injection Fuel Feed Pipe Replacement - Right Side

* Fuel Injection Fuel Rail Assembly Replacement - Bank 1 Fuel Injection Fuel Rail Assembly Replacement - Bank 1

* Fuel Injection Fuel Rail Assembly Replacement - Bank 2 Fuel Injection Fuel Rail Assembly Replacement - Bank 2

* Fuel Return Hose Replacement Fuel Return Hose Replacement

* Fuel Return Pipe Replacement Fuel Return Pipe Replacement

6. A fuel leak may be caused by restricted return fuel lines. Refer to Fuel Return System Diagnosis Fuel Return System Diagnosis.