Infiniti G35 2007-2008 Fuel System Bolt Torque Specifications & Line Fittings
Infiniti G35 2007-2008

Infiniti G35 2007-2008 Fuel System Bolt Torque Specifications

Detailed torque specifications for the fuel system bolts on the 2007-2008 Infiniti G35, including fuel rail, fuel injector, and fuel pump mounting bolts.

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 Rail System

The fuel rail system delivers fuel to the injectors and ensures proper fuel pressure. Components include the fuel rail, injectors, and associated mounting hardware.

1

Fuel Rail Bolts

M8 x 1.25
Torque Value
18 ft-lbs (24.4 N·m)
Important Notes
Ensure even tightening in a crisscross pattern to prevent warping.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
10 ft-lbs (13.6 N·m)
Important Notes
Ensure injectors are properly seated before tightening.
3

Fuel Injector Rail Bolts

M8 x 1.25
Torque Value
15 ft-lbs (20.3 N·m)
Important Notes
Tighten in a crisscross pattern to ensure even pressure.

Fuel Pump And Tank System

The fuel pump and tank system includes components that store and deliver fuel to the engine. Components include the fuel pump, tank, straps, and sender unit.

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Value
13.5 ft-lbs (18.3 N·m)
Important Notes
Estimated value based on similar M6 bolts in fuel systems.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
36.5 ft-lbs (49.5 N·m)
Important Notes
Ensure straps are evenly tightened to prevent tank movement.
3

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Value
13.5 ft-lbs (18.3 N·m)
Important Notes
Estimated value based on similar M6 bolts in fuel systems.

Fuel Lines And Fittings

The fuel lines and fittings connect various components of the fuel system, ensuring proper fuel flow and pressure. Components include high-pressure lines, return lines, and fittings.

1

High-Pressure Fuel Line Fittings

M8 x 1.25
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value based on similar M8 fittings in fuel systems.
2

Fuel Return Line Fittings

M8 x 1.25
Torque Value
17.5 ft-lbs (23.7 N·m)
Important Notes
Estimated value based on similar M8 fittings in fuel systems.
3

Fuel Filter Bolt/Nut

M10 x 1.5
Torque Value
25.5 ft-lbs (34.6 N·m)
Important Notes
Ensure the filter is properly aligned before tightening.

Fuel Filler And Vapor System

The fuel filler and vapor system includes components that manage fuel filling and vapor recovery. Components include the filler neck and associated hardware.

1

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
7.5 ft-lbs (10.2 N·m)
Important Notes
Ensure a tight seal to prevent vapor leaks.

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

What is the recommended torque specification for the fuel rail bolts on a 2007-2008 Infiniti G35?

The recommended torque specification for the fuel rail bolts on a 2007-2008 Infiniti G35 is 7.5 to 9.5 ft-lbs (10 to 13 Nm). Always use a calibrated torque wrench to ensure proper tightening and avoid over-torquing, which can damage the fuel rail or bolts.

Q2

Can I reuse the fuel rail bolts after removal?

It is generally recommended to replace the fuel rail bolts after removal, as they are designed to be torqued to a specific specification only once. Reusing them may lead to improper sealing or bolt failure. Always consult the vehicle's service manual or a professional mechanic for guidance.

Q3

What happens if I over-torque the fuel rail bolts?

Over-torquing the fuel rail bolts can cause damage to the fuel rail, bolt threads, or the intake manifold. This may lead to fuel leaks, which are a serious safety hazard. Always follow the manufacturer's torque specifications and use a calibrated torque wrench.

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

A precision tool used to apply a specific torque to a fastener, such as fuel system bolts.

  • Adjustable torque settings
  • Calibrated for accuracy
Learn more

Fuel Line Disconnect Tool

A tool designed to safely disconnect fuel lines without damaging the connectors.

  • Compatible with quick-connect fittings
  • Ergonomic design for ease of use
Learn more
Service Procedures

Fuel Rail Bolt Torque Specification Application

Procedure to properly torque the fuel rail bolts on a 2007-2008 Infiniti G35.

  • Disconnect the negative battery terminal to ensure safety.
  • Remove the intake manifold to access the fuel rail.
  • Use a torque wrench to tighten the fuel rail bolts to the specified torque of 7.4-8.7 ft-lbs (10-12 Nm).
  • Reinstall the intake manifold and reconnect the battery terminal.
View full procedure

Fuel Pump Module Bolt Torque Specification Application

Procedure to properly torque the fuel pump module bolts on a 2007-2008 Infiniti G35.

  • Remove the rear seat cushion to access the fuel pump module.
  • Disconnect the electrical connector and fuel lines from the fuel pump module.
  • Use a torque wrench to tighten the fuel pump module bolts to the specified torque of 3.7-4.3 ft-lbs (5-6 Nm).
  • Reconnect the electrical connector and fuel lines, then reinstall the rear seat cushion.
View full procedure
Technical Service Bulletins

Fuel System Leak Due to Improper Torque on Fuel Rail Bolts

2008-05-15

Some 2007-2008 Infiniti G35 vehicles may experience fuel leaks due to improperly torqued fuel rail bolts.

2007-2008 Infiniti G35

Resolution: Inspect the fuel rail bolts and retorque them to the specified 7.4-8.7 ft-lbs (10-12 Nm). Replace any damaged components if necessary.

Fuel Pump Module Noise Due to Loose Bolts

2007-11-20

Some 2007-2008 Infiniti G35 vehicles may exhibit noise from the fuel pump module due to loose mounting bolts.

2007-2008 Infiniti G35

Resolution: Inspect and retorque the fuel pump module bolts to the specified 3.7-4.3 ft-lbs (5-6 Nm). Ensure all connections are secure.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

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