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Fuel Leak Diagnosis

Fuel Leak Diagnosis

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


Reference Information

Special Tools

EN 28428-E High-Intensity Black Light Kit

For equivalent regional tools, refer to Special Tools .

System Testing


1. Clean all of the fuel system lines using brake cleaning solvent, and let dry. For example, the fuel injection pump, the fuel injectors and rail, and supply lines.

2. Add 250 g of oil dye to the fuel tank.

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

4.
Note

A fuel leak may be caused by a restricted fuel return line.


Inspect for fuel leaks around the fuel injection pump, fuel rails, and fuel supply lines with a EN 28428-E High-Intensity Black Light Kit. A fuel leak should not exist.

5. If a fuel leak is located, tighten or replace any leaking lines or components.