Buick Regal: Fuel Leak Diagnosis

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
• { If equipped } Fuel Return Pipe

Reference Information

Special Tools

• J-28428-E High-Intensity Black Light Kit
• J-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

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. Perform the scan tool control function: Fuel Pressure Control - Regulator 1 - Increase - Maximum Pressure - If applicable

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.

5. Use the special tool: J-28428-E High-Intensity Black Light Kit or J-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 Return Side of the Fuel System

• { High Pressure Side of the Fuel System } If a leak is present

Repair or replace as necessary.

• { Return Side of the Fuel System } If a leak is present

Refer to: Diagnostic Procedure Instructions

• Go to next step: If no leak is present

6. All OK.

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