Buick Regal 2011-2017 Fuel System Bolt Torque Specifications & Line Fittings
Buick Regal 2011-2017

Buick Regal 2011-2017 Fuel System Bolt Torque Specifications

This page provides detailed torque specifications for fuel system bolts on the 2011-2017 Buick Regal. Includes torque values for fuel line connections, fuel pump assembly, and other fuel system components.

Updated

Important Information

Safety guidelines and reference information for proper torque application

Quick Reference Guide
ft-lbs → Nm
× 1.356
ft-lbs → kg-m
× 0.138
Nm → ft-lbs
× 0.738
in-lbs → ft-lbs
× 0.083

Common Torque Patterns

Star Pattern

Used for wheels and other circular bolt patterns

Star Pattern torque pattern diagram showing proper bolt tightening sequence
Cross Pattern

Used for gaskets and cover plates

Cross Pattern torque pattern diagram showing proper bolt tightening sequence
Sequential Pattern

Used for head bolts and other critical components

Sequential Pattern torque pattern diagram showing proper bolt tightening sequence

Common Mistakes to Avoid

Over-tightening

Exceeding the specified torque value can stretch or break fasteners, damage threads, or crack components.

Prevention:

Always use a calibrated torque wrench and follow specifications exactly.

Incorrect Torque Sequence

Tightening bolts in the wrong order can cause uneven pressure distribution and potential leaks or damage.

Prevention:

Follow the manufacturer's specified torque sequence pattern.

Dirty Threads

Dirt, rust, or old thread locker can affect torque readings and proper fastener tension.

Prevention:

Clean and inspect all threads before assembly. Use new thread locker if specified.

Reusing TTY Bolts

Torque-to-yield bolts are designed to stretch and must not be reused.

Prevention:

Always replace TTY bolts with new ones. They are single-use only.

Dry vs. Lubricated

Not accounting for whether torque specs are for dry or lubricated fasteners can lead to incorrect tension.

Prevention:

Check if specs are for dry or lubricated threads. Use specified lubricant when required.

Recommended Tools

Torque Wrench (1/4" Drive)

Range: 2-25 ft-lbs
Small fasteners, delicate components

Torque Wrench (3/8" Drive)

Range: 10-100 ft-lbs
Most common automotive fasteners

Torque Wrench (1/2" Drive)

Range: 30-250 ft-lbs
Large fasteners, wheels

Angle Gauge

Torque-to-yield (TTY) bolts

Torque Wrench Care

  • Calibrate annually or after 5,000 clicks
  • Store at lowest setting
  • Keep clean and lubricated

Search Specifications

Search by component name, bolt size, or description

Torque Calculator

Convert between different torque units

Fuel Pump Module

Specifications for components located within the fuel tank, including the fuel pump module, sending unit, and associated connections.

1

Fuel Pump Module Retaining Ring Lock Ring

N/A
Torque Value
30 ft-lbs (41 N·m)
Important Notes
This ring secures the fuel pump module to the fuel tank. Proper torque is critical for a fuel-tight seal and prevents fuel leaks. Estimated value based on similar applications.
2

Fuel Pump Module Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts secure the fuel pump assembly to the tank. Proper torque prevents leaks and ensures the module is held securely. Estimated based on bolt size and similar applications.
3

Fuel Line Connection to Fuel Pump Module

N/A
Torque Value
25 ft-lbs (34 N·m)
Important Notes
This connection can vary but is typically a threaded fitting. Proper torque prevents fuel leaks and ensures secure connection for fuel supply to the engine. Estimated, industry standard for fuel fittings.
4

Fuel Level Sending Unit Fasteners

M5 x 0.8
Torque Value
4.4 ft-lbs (6 N·m)
Important Notes
These fasteners secure the fuel level sensor, ensuring accurate fuel level readings. Overtightening can damage the sensor. Estimated based on bolt size, Industry Standard.

Fuel Rail Injectors

Specifications for components located in the engine compartment, including the fuel rail, injectors, and associated connections.

1

Fuel Rail Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts secure the fuel rail to the intake manifold. Proper torque ensures a leak-free seal and proper injector operation. Industry Standard.
2

Fuel Injector Retaining Bracket/Bolt

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Secures injectors into the fuel rail and intake manifold, maintaining pressure integrity. Under or overtightening can cause leaks or injector malfunction. Estimated, Industry standard, based on similar GM models.
3

Fuel Rail Pressure Sensor Bolt

M5 x 0.8
Torque Value
5.2 ft-lbs (7 N·m)
Important Notes
Secures the pressure sensor to the fuel rail, ensuring accurate fuel pressure readings. Estimated based on bolt size and sensor application.
4

Fuel Line Quick Connect Fitting Retaining Clip

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
No specific torque. These clips are designed to be properly seated by hand. Inspect for secure connection and integrity. Industry standard for fuel line quick connect fittings.

Fuel Tank

Specifications for mounting the fuel tank, filler neck, and vent valve.

1

Fuel Tank Straps/Mounting Bolts

M10 x 1.5
Torque Value
37 ft-lbs (50 N·m)
Important Notes
These bolts secure the fuel tank to the vehicle chassis. Proper torque is critical for safety, preventing tank movement, and potential damage to the fuel system. Estimated based on bolt size, industry standard, varies based on exact application.
2

Fuel Tank Straps/Mounting Bolts

M12 x 1.75
Torque Value
50 ft-lbs (68 N·m)
Important Notes
These bolts secure the fuel tank to the vehicle chassis. Proper torque is critical for safety, preventing tank movement, and potential damage to the fuel system. Estimated based on bolt size, industry standard, varies based on exact application.
3

Fuel Tank Filler Neck Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
These bolts secure the fuel filler neck to the vehicle body. Proper torque prevents leaks and allows proper sealing at the fuel cap. Estimated, industry standard.
4

Fuel Tank Vent Valve Mounting Screws/Bolts

M5 x 0.8
Torque Value
4.4 ft-lbs (6 N·m)
Important Notes
Secures the vent valve to the fuel tank or surrounding area. Correct torque prevents leaks and ensures proper system venting. Estimated, Industry Standard.

Evap System

Specifications for components related to the Evaporative Emission Control System.

1

Charcoal Canister Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Secures the charcoal canister to the chassis. Industry Standard.
2

EVAP Purge Solenoid Valve Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
These bolts secure the EVAP purge solenoid valve to the engine compartment. Proper torque ensures a secure mount. Estimated, based on common EVAP component fasteners.
3

EVAP Line Fittings

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Refer to manufacturer specifications. Usually hand-tight followed by a quarter turn or click until snug. These fittings are often plastic quick connect style and do not use torque specifications. Proper installation ensures a secure connection and no leaks. Industry standard for quick-connect fittings

Troubleshooting Guide

Common issues, diagnostic steps, and prevention guidelines

Common Issues

Bolt stretching, stripped threads, uneven torque patterns

Loose Components

Symptoms:
  • Rattling or vibration noises
  • Visible movement in components
  • Uneven panel gaps
Solutions:
  • Clean threads and mounting surfaces
  • Replace damaged fasteners
  • Apply proper torque in sequence
  • Use thread locker if specified

Stripped Fasteners

Symptoms:
  • Unable to achieve proper torque
  • Fastener spins freely
  • Visible thread damage
Solutions:
  • Use thread repair kit if appropriate
  • Install thread insert (HeliCoil)
  • Replace component if threaded hole is damaged
  • Upgrade to higher grade fastener if recommended

Overtightened Components

Symptoms:
  • Cracked or deformed parts
  • Broken fasteners
  • Compressed gaskets or seals
Solutions:
  • Replace damaged components
  • Use new fasteners
  • Follow proper torque sequence
  • Verify correct torque specifications

Diagnostic Steps

Visual inspection, torque verification, thread assessment

1

Visual Inspection

Inspect the affected area for any visible signs of damage or wear

  • Check for cracks or deformation
  • Look for signs of excessive wear
  • Verify proper fastener installation
2

Torque Verification

Verify the torque applied to the fasteners

  • Check the torque wrench calibration
  • Verify the torque specification
  • Compare the applied torque to the specification
3

Thread Assessment

Assess the condition of the threads

  • Check for signs of thread damage
  • Verify the thread type and size
  • Check for proper thread engagement

Prevention Guidelines

Best practices, maintenance tips, tool care

Best Practices

  • Always follow the recommended torque specification
  • Use the correct type and size of fasteners
  • Verify the torque wrench calibration regularly

Maintenance Tips

  • Regularly inspect the affected area for signs of wear or damage
  • Replace damaged or worn-out components promptly
  • Keep the work area clean and organized

Tool Care

  • Regularly clean and maintain the torque wrench
  • Store the torque wrench in a dry and secure location
  • Verify the torque wrench calibration before each use

Frequently Asked Questions

Find answers to common questions about torque specifications

Q1

Why are proper torque specifications important for fuel system bolts?

Proper torque is crucial to prevent fuel leaks, which pose a significant fire hazard. Over-tightening can damage threads or components, leading to leaks. Under-tightening can cause the joint to loosen, also leading to leaks and potential fuel system failure. Using the specified torque ensures a secure and sealed connection.

Q2

What happens if I over-torque a fuel rail bolt?

Over-torquing can damage the bolt threads, fuel rail mounting points, or the fuel rail itself. This can result in leaks or make it difficult to remove the bolt later. In some cases, the bolt can stretch or even break. If damage occurs, you will likely have to replace the damaged component and potentially the bolt as well.

Q3

What happens if I under-torque a fuel line connection?

Under-torquing a fuel line connection will not create a proper seal. This will lead to fuel leaks, which can cause fuel starvation to the engine, create a fire hazard and environmental contamination. You may notice a fuel odor or visual evidence of leaking fuel. Loose connections may also lead to intermittent engine issues.

Q4

Can I reuse fuel line bolts after removing them?

Generally, it's recommended to replace fuel line bolts, especially those that utilize sealing washers. This is because the sealing washers compress on use and do not provide proper sealing on re-use. Reusing bolts can increase the risk of leaks. If reusing, carefully inspect for damage, but replacement is highly advisable to prevent leaks.

Q5

Do I need to use a threadlocker on fuel system bolts?

Generally, threadlocker is not needed on fuel system bolts unless specified in the repair manual. Overuse can be problematic as the excess can contaminate the fuel system, or make it difficult to remove them later, resulting in potential damage. Follow OEM guidelines.

Environmental Considerations

Temperature, humidity, and seasonal effects on torque specifications

Temperature Effects

Includes: High Heat, Cold Weather, Thermal Cycling

Temperature can significantly impact torque values and fastener behavior

Cold Weather

Effects:
  • Increased material brittleness
  • Higher torque required due to thread contraction
  • Reduced thread lubricant effectiveness
Recommendations:
  • Allow components to warm to room temperature when possible
  • Consider using winter-grade thread lubricants
  • Check torque values more frequently during winter months

Hot Weather

Effects:
  • Thermal expansion of components
  • Decreased friction in threads
  • Accelerated lubricant breakdown
Recommendations:
  • Check torque when components are at normal operating temperature
  • Use temperature-resistant thread lockers
  • Consider re-torquing after heat cycles

Humidity and Corrosion

Covers: Rust Prevention, Salt Exposure, Moisture Control

Moisture and corrosion can affect fastener integrity and torque values

High Humidity

Effects:
  • Accelerated corrosion formation
  • Reduced friction coefficient
  • Potential thread seizing
Prevention:
  • Use corrosion-resistant fasteners
  • Apply appropriate anti-seize compounds
  • Maintain proper protective coatings

Salt Exposure

Effects:
  • Rapid corrosion development
  • Thread damage
  • Seized fasteners
Prevention:
  • Regular underbody washing
  • Use of sacrificial anodes where appropriate
  • Application of protective coatings

Seasonal Maintenance

Spring, Summer, Fall, and Winter maintenance schedules

Spring

  • Inspect for winter damage
  • Clean and protect exposed fasteners
  • Check torque on critical components

Summer

  • Monitor heat-affected components
  • Check expansion-related loosening
  • Inspect cooling system mounts

Fall

  • Prepare for winter conditions
  • Apply corrosion protection
  • Verify all fasteners are properly torqued

Winter

  • More frequent inspection of critical fasteners
  • Check for salt damage
  • Monitor suspension component torque

Related Resources

Tools, service procedures, and technical bulletins

Recommended Tools

Torque Wrench (1/4 inch drive)

A torque wrench is essential for accurately tightening fuel system bolts to the specified torque value. 1/4 inch drive is often preferred for smaller bolts in the fuel system.

  • Accurate torque measurement
  • Click-type mechanism for consistent torque application
Learn more

Torque Wrench (3/8 inch drive)

A torque wrench is essential for accurately tightening fuel system bolts to the specified torque value. 3/8 inch drive is common for larger fuel system bolts and fittings.

  • Accurate torque measurement
  • Click-type mechanism for consistent torque application
Learn more

Socket Set (Metric)

A metric socket set is necessary to fit the various bolt heads in the fuel system. Ensure to have the appropriate sizes for the bolts on the fuel rail, fuel pump module, and fuel injectors.

  • Variety of metric sizes
  • Durable construction
Learn more

Wrench Set (Metric)

A metric wrench set is useful for holding a nut on a fastener while torquing it or accessing tight locations.

  • Variety of metric sizes
  • Durable construction
Learn more
Service Procedures

Fuel Rail Bolt Torque Procedure

This procedure outlines the steps for torquing the fuel rail mounting bolts to the correct specification. Improper torque can lead to fuel leaks or damage.

  • Locate the fuel rail mounting bolts.
  • Consult the vehicle's service manual for the specific torque specification for your engine variant.
  • Using the correct size socket and torque wrench, gradually tighten all fuel rail bolts in a crisscross pattern.
  • Tighten each bolt to the specified torque value.
  • Double-check each bolt to ensure it is tightened to the correct torque.
View full procedure

Fuel Injector Retaining Bolt Torque Procedure

This procedure outlines the steps for torquing the fuel injector retaining bolts. Improper torque can lead to fuel leaks or damage to the fuel injectors.

  • Locate the fuel injector retaining bolts.
  • Consult the vehicle's service manual for the specific torque specification.
  • Using the correct size socket and torque wrench, carefully tighten the retaining bolts.
  • Tighten each bolt to the specified torque value.
  • Double-check each bolt to ensure it is tightened to the correct torque.
View full procedure

Fuel Pump Module Retaining Ring Torque Procedure

This procedure outlines the steps for properly torquing the fuel pump module retaining ring. Improper torque can result in fuel leaks or damage to the tank.

  • Locate the fuel pump module retaining ring.
  • Consult the vehicle's service manual for the specific torque specification.
  • Using the correct size tool and torque wrench, carefully tighten the retaining ring.
  • Tighten the ring to the specified torque value.
  • Double-check the ring to ensure it is tightened to the correct torque.
View full procedure
Technical Service Bulletins

Fuel Leakage from Fuel Rail Fasteners

2014-05-15

Some 2011-2014 Buick Regal models may experience fuel leakage due to improperly torqued fuel rail fasteners. This bulletin outlines correct procedure for torque and inspection.

2011-2014

Resolution: Inspect fuel rail fasteners for leaks. Replace any damaged seals. Torque all fasteners to the specified torque value as outlined in the service manual. It is critical to use a torque wrench.

Fuel Pump Module Retaining Ring Issues

2016-11-20

Certain 2014-2017 Buick Regal models have shown issues with improperly tightened fuel pump module retaining rings leading to fuel smell and/or pressure problems. This is due to inadequate torque.

2014-2017

Resolution: Inspect the fuel pump module area for leaks. Torque the retaining ring to specified specifications. Replace the sealing ring if required.

Fuel Injector Seal Degradation and Torque Issues

2017-08-01

Some 2012-2017 Buick Regal models may exhibit fuel leaks around fuel injectors due to degraded seals and improperly torqued retaining bolts. This is particularly common when working on the fuel system without proper torque application.

2012-2017

Resolution: Replace the fuel injector seals and ensure fuel injector retaining bolts are torqued to the exact specified torque value.

About the Author

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Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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