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.
READ NEXT:
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.
Diag
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.
Diag
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.
Diag
SEE MORE:
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.
DTC Descriptors
D
Diagnostic Instructions
Perform the Diagnostic System Check prior to using this diagnostic
procedure: Refer to Diagnostic System
Check - Vehicle
Review the description of Strategy Based Diagnosis:Strategy Based
Diagnosis
An overview of each diagnostic category can be found here: Refer to