Fuel Leak Diagnosis

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 4709479 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions Diagnostic Aids Fluorescent dye assists in locating leaks in the system. A high-intensity black light will make the dye glow: Green or Yellow Illuminate the area(s) of concern For example: G18 High Pressure Fuel Pump Q17 Fuel Injector Fuel Line Fuel Rail Reference Information Special Tools GE-28428-E High-Intensity Black Light Kit GE-42220 Universal 12 V Leak Detection Lamp Circuit/System Verification

1. Perform the following action: Clean all of the components in the suspected area using a cleaning solution and allow the components to dry: Fuel System

Caution

When performing a Fuel Leak Diagnosis, it is VERY IMPORTANT to use only GM approved Oil Dye, Part Number 88861206. If any other oil dye is used, it will cause damage to the fuel injection system components, as well as the emission control components. This will result in necessary replacement of the damaged components.

2. Perform the following action: Add 237 mL (8 US fl oz) of GM Approved Oil Dye to the component: Fuel Tank — Primary
3. Engine » Idling — For 3 to 5 min
4. Use the special tool: GE-28428-E High-Intensity Black Light Kit or GE-42220 Universal 12 V Leak Detection Lamp & Illuminate the area(s) of concern Verify there are no leaks in the component/system: High Pressure Side of the Fuel System or Low Pressure Side of the Fuel System ⇒ If a leak is present Repair or replace as necessary ⇓ If no leak is present
5. All OK.