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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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.
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Fuel Injector Circuit 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.
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Alcohol/Contaminants-In-Fuel 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.
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SEE MORE:
Windshield Wiper/Washer
With the ignition on or in ACC/
ACCESSORY, move the windshield
wiper lever to select the wiper
speed.
HI : Use for fast wipes.
LO : Use for slow wipes.
INT : Use for intermittent wipes. To
adjust wipe frequency, turn the band
up for more frequent wipes or down
for less frequent wipes.
OFF : Use
Vehicle Load Limits
It is very important to know how
much weight the vehicle can
carry. This weight is called the
vehicle capacity weight and
includes the weight of all
occupants, cargo, and all
nonfactory-installed options.
Two labels on the vehicle may
show how much weight it may
properly carry: the Tire and
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