Infiniti M35 2006-present Fuel System Bolt Torque Specifications & Line Fittings
Infiniti M35 2006-present

Infiniti M35 2006-present Fuel System Bolt Torque Specifications

Detailed torque specifications for the fuel system bolts on the 2006-Present Infiniti M35, including fuel rail bolts, fuel pump mounting bolts, and fuel line fittings.

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 includes components responsible for delivering fuel to the injectors and maintaining proper fuel pressure. Proper torque on these bolts ensures leak-free operation and system integrity.

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Value
16.5 ft-lbs (22 N·m)
Important Notes
Estimated value based on similar models and industry standards for M8 bolts in fuel systems.
2

Fuel Injector Retaining Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for M6 bolts in injector applications.
3

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for M6 bolts.

Fuel Tank System

The fuel tank system includes components responsible for storing and delivering fuel to the engine. Proper torque on these bolts ensures safety, prevents leaks, and maintains system integrity.

1

Fuel Pump Module Mounting Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for M6 bolts in fuel tank applications.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
27.5 ft-lbs (37.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for M10 bolts in fuel tank applications.
3

Fuel Tank Filler Neck Bolts

M6 x 1.0
Torque Value
8 ft-lbs (10.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for M6 bolts.

Fuel Delivery System

The fuel delivery system includes components responsible for transporting fuel from the tank to the engine. Proper torque on these bolts ensures leak-free operation and system integrity.

1

Fuel Line Banjo Bolts

M10 x 1.5
Torque Value
27.5 ft-lbs (37.5 N·m)
Important Notes
Estimated value based on similar models and industry standards for banjo bolts in fuel systems.
2

Fuel Filter Housing Bolts

M8 x 1.25
Torque Value
16.5 ft-lbs (22 N·m)
Important Notes
Estimated value based on similar models and industry standards for M8 bolts in fuel filter applications.

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 2006-Present Infiniti M35?

The recommended torque specification for the fuel rail bolts on a 2006-Present Infiniti M35 is typically 8-10 ft-lbs (10.8-13.6 Nm). Always refer to the vehicle's service manual for the exact specification, as variations may exist depending on the model year or specific engine configuration.

Q2

Can I reuse the fuel rail bolts after removal?

It is generally recommended to replace the fuel rail bolts with new ones after removal, as they are often torque-to-yield bolts designed for one-time use. Reusing them can lead to improper sealing or bolt failure, which may cause fuel leaks.

Q3

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

Over-torquing the fuel rail bolts can damage the fuel rail, warp the mating surface, or strip the threads in the cylinder head. This can lead to fuel leaks, which are a fire hazard. Always use a calibrated torque wrench to ensure proper torque application.

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 a fuel bolt.

  • 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 various fuel line sizes
  • Ergonomic design for ease of use
Learn more

Socket Set

A set of sockets and extensions for accessing and tightening fuel system bolts.

  • Includes metric sizes
  • Durable construction
Learn more
Service Procedures

Fuel Rail Bolt Torque Specification

Procedure to properly torque the fuel rail bolts on a 2006-Present Infiniti M35.

  • Disconnect the negative battery terminal to ensure safety.
  • Remove the engine cover to access the fuel rail.
  • Use a fuel line disconnect tool to detach the fuel lines from the rail.
  • Remove the fuel rail bolts using a socket set.
  • Clean the bolt threads and apply a small amount of thread locker if specified.
  • Reinstall the fuel rail and hand-tighten the bolts.
  • Use a torque wrench to tighten the fuel rail bolts to the specified torque of 8.7 ft-lbs (12 Nm).
  • Reconnect the fuel lines and ensure they are securely attached.
  • Reinstall the engine cover and reconnect the battery terminal.
View full procedure
Technical Service Bulletins

Fuel System Leak Due to Improper Torque on Fuel Rail Bolts

2015-03-15

Reports of fuel leaks in the M35 due to improperly torqued fuel rail bolts.

2006-2010 Infiniti M35

Resolution: Ensure fuel rail bolts are torqued to the specified 8.7 ft-lbs (12 Nm) using a calibrated torque wrench.

Fuel Pressure Loss After Fuel Rail Service

2018-07-10

Some vehicles experience fuel pressure loss after fuel rail service due to incorrect bolt torque.

2006-Present Infiniti M35

Resolution: Verify torque specifications and re-torque fuel rail bolts to 8.7 ft-lbs (12 Nm) if necessary.

About the Author

Expert automotive knowledge and experience

Alan Montanye - Automotive Technical Specialist
ASE

Alan Montanye

Automotive Technical Specialist

ASE Master Certified Technician with over a decade of hands-on experience in automotive repair and diagnostics.

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