Fuel Leak Diagnosis
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the air cleaner assemble. Refer to Air Cleaner Assembly Replacement .
- Clean all of the fuel lines between the fuel injection pump and the fuel injectors using brake cleaning solvent, and let dry.
- 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 .
- Start and idle the engine for 3-5 minutes.
- Command the fuel pressure control to 160 MPa (23,206 psi) with a scan tool.
- Inspect for fuel leaks around the fuel injection pump, fuel rails, and fuel injector supply lines with a J 28428-E
High Intensity Black Light Kit. See Special Tools
.
Tighten or replace any leaking lines or components. Refer to the following:
- Fastener Tightening Specifications
- Fuel Injection Line Routing Diagram
- Fuel Injection Fuel Return Pipe Replacement - Left Side
- Fuel Injection Fuel Return Pipe Replacement - Right Side
- Fuel Feed Pipe Replacement
- Fuel Injection Fuel Rail Assembly Replacement - Bank 1
- Fuel Injection Fuel Rail Assembly Replacement - Bank 2
- Fuel Injection Pump Replacement
- Fuel Injector Replacement (Left)Fuel Injector Replacement (Right)
- A fuel leak may be caused by restricted return fuel lines. Refer to Fuel Return System Diagnosis .