Acura TL 2004-2008 Fuel System Bolt Torque Specifications & Line Fittings
Acura TL 2004-2008

Acura TL 2004-2008 Fuel System Bolt Torque Specifications

Detailed torque specifications for fuel-related bolts on the 2004-2008 Acura TL, including fuel pump, fuel filter, and fuel rail 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 Delivery System

Torque specifications for the fuel delivery system components.

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Torque bolts in a cross pattern to ensure even pressure distribution. Step torque recommended.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure proper injector seating before tightening.
3

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Verify specific spec if available.
4

Fuel Filter Mounting Bolt/Nut

M8 x 1.25
Torque Value
22 ft-lbs (30 N·m)
Important Notes
Tighten to specified torque to ensure secure mounting.
5

Fuel Line Fittings (Various)

Varies by fitting
Torque Value
18 ft-lbs (24 N·m)
Important Notes
Estimated value. Torque range is 12-22 ft-lbs (16-30 N·m), verify specific fitting for proper torque value.

Fuel Tank System

Torque specifications for the fuel tank and related components.

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure fuel pump is properly seated before tightening.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
16 ft-lbs (22 N·m)
Important Notes
Tighten evenly to ensure secure tank mounting.
3

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
7 ft-lbs (10 N·m)
Important Notes
Ensure the filler neck is properly aligned before tightening.
4

Fuel Tank Sending Unit Bolts

M6 x 1.0
Torque Value
9 ft-lbs (12 N·m)
Important Notes
Estimated value. Use caution when tightening to avoid damaging the sending unit. Verify specific spec if available.

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 is it important to use the correct torque specifications for fuel system bolts?

Using the correct torque specifications is crucial for maintaining a leak-free fuel system. Over-tightening can damage threads, crush gaskets, and cause fuel leaks, leading to fire hazards. Under-tightening can also lead to leaks due to insufficient sealing. These issues can result in engine performance problems, fuel inefficiency, and dangerous situations.

Q2

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

Over-torquing a fuel rail bolt can strip the threads in the fuel rail or the cylinder head, requiring costly repairs. It can also deform the fuel rail itself, leading to improper sealing and leaks. In severe cases, a snapped bolt could occur, creating a major safety issue.

Q3

What if I don't have a torque wrench? Can I just tighten it 'by feel'?

While experienced mechanics may have a good 'feel' for torque, it's not recommended for critical fuel system components. The fuel system operates under pressure, and using a torque wrench is essential for accurate tightening. 'By feel' methods can easily lead to under- or over-tightening, both with potentially serious consequences.

Q4

Should I use new gaskets or seals when working on the fuel system?

Absolutely. Always replace gaskets and seals when disassembling any part of the fuel system. Old gaskets may be compressed, cracked, or deformed and will not provide a reliable seal. Reusing old gaskets is a common cause of fuel leaks after service. Failure to replace fuel system gaskets can easily result in fuel leakage.

Q5

How often should fuel system components be inspected for tightness?

A good practice is to inspect fuel system connections for leaks or loose bolts at least every 12 months or 12,000 miles, or anytime work is performed on any part of the fuel system. Regular inspection can prevent minor issues from developing into serious problems. Specifically check any components where work was previously performed.

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 (3/8" Drive)

A calibrated torque wrench is essential for accurately tightening fuel system bolts to the specified torque.

  • Click-type mechanism for accurate torque application
  • Range of 10-80 ft-lbs (or equivalent in Nm)
Learn more

Socket Set (3/8" Drive)

A socket set containing the correct sizes for the fuel system bolts.

  • Includes 10mm, 12mm, and 14mm sockets
  • Deep sockets recommended for hard-to-reach bolts
Learn more

Torx Bit Set

For accessing the fuel pump module access panel.

  • Includes various Torx sizes
  • Tamper-proof Torx bits may be required
Learn more

Fuel Line Disconnect Tool

Special tool for safely disconnecting fuel lines without damage.

  • Made of durable plastic or metal
  • Various sizes available to fit different fuel line connectors
Learn more
Service Procedures

Fuel Filter Replacement

Procedure for replacing the fuel filter, including torque specifications for related bolts.

  • Depressurize the fuel system.
  • Disconnect the fuel lines from the fuel filter using the fuel line disconnect tool.
  • Remove the old fuel filter.
  • Install the new fuel filter.
  • Connect the fuel lines to the new filter.
  • Torque the filter mounting bolts to 8.7 lb-ft (12 Nm).
  • Reconnect any disconnected electrical connectors.
  • Check for fuel leaks after reassembly.
View full procedure

Fuel Pump Access Panel Removal/Installation

Procedure for accessing the fuel pump, including torque specifications for the access panel screws.

  • Access the fuel pump access panel, usually under the rear seat.
  • Remove the access panel securing screws using the Torx bit.
  • Torque the access panel screws to 4.4 lb-ft (6 Nm).
  • Ensure proper sealing of the access panel after reassembly.
View full procedure

Fuel Rail Bolt Torque Procedure

Procedure for torquing fuel rail mounting bolts.

  • Ensure proper alignment of the fuel rail on the intake manifold.
  • Install the fuel rail mounting bolts by hand.
  • Torque the fuel rail mounting bolts to 16 lb-ft (22 Nm).
  • Double-check the torque on all bolts.
View full procedure
Technical Service Bulletins

Fuel Leak from Filter Connection

2006-04-15

Some 2004-2006 TL models have reported fuel leaks at the filter connections due to improper torque or damaged connectors.

2004-2006

Resolution: Ensure proper torque of 8.7 lb-ft (12 Nm) on fuel filter bolts and inspect connectors for any damage before installation. Replace filter or lines if necessary.

Fuel Rail Bolt Loosening Issue

2007-11-20

Reports of loose fuel rail mounting bolts on some 2005-2007 models.

2005-2007

Resolution: Inspect fuel rail bolts and torque to specification of 16 lb-ft (22 Nm). Use thread-locker on bolts if needed.

About the Author

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Alan Montanye - Automotive Technical Specialist
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Alan Montanye

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  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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