Chrysler Concorde 1993-1997 Fuel System Bolt Torque Specifications & Line Fittings
Chrysler Concorde 1993-1997

Chrysler Concorde 1993-1997 Fuel System Bolt Torque Specifications

Detailed torque specifications for fuel system bolts on the 1993-1997 Chrysler Concorde, including fuel rail, fuel pump, and fuel line connections.

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 And Injectors

This section covers the torque specifications for components directly related to the fuel rail and injectors, including their mounting hardware and connections.

1

Fuel Rail Mounting Bolts

M8 x 1.25
Torque Value
10.5 ft-lbs (14 N·m)
Important Notes
Torque bolts evenly to ensure proper seal between the fuel rail and intake manifold. Do not overtighten.
2

Fuel Injector Mounting Bolts

M6 x 1.0
Torque Value
10.5 ft-lbs (14 N·m)
Important Notes
Torque bolts evenly to secure the fuel injectors to the fuel rail or manifold. Do not overtighten.
3

Fuel Pressure Regulator Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Torque bolts evenly. Do not overtighten, as this can damage the regulator.

Fuel Delivery

This section covers the torque specifications for components related to the fuel pump, fuel tank, and their associated hardware.

1

Fuel Pump Mounting Bolts

M6 x 1.0
Torque Value
9.6 ft-lbs (13 N·m)
Important Notes
Torque bolts evenly to maintain a proper fuel tank seal and prevent fuel leaks. Do not over tighten.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
30 ft-lbs (41 N·m)
Important Notes
Ensure tank straps are properly aligned before tightening. Do not overtighten.
3

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
10.5 ft-lbs (14 N·m)
Important Notes
Tighten evenly to ensure a leak-free seal. Do not overtighten.

Fuel Filtration

This section covers the torque specifications for the fuel filter and its mounting hardware.

1

Fuel Filter Mounting Bolt/Nut

M8 x 1.25
Torque Value
25 ft-lbs (34 N·m)
Important Notes
Ensure filter is properly aligned before tightening. Do not overtighten.

Fuel Lines And Evap

This section covers the torque specifications for fuel line fittings and fuel vapor canister mounting.

1

Fuel Line Fittings (Threaded)

Varies - See Notes
Torque Value
20 ft-lbs (27 N·m)
Important Notes
Estimated value. Torque varies by fitting size and material. Ensure proper sealing at the fitting. Always use a back-up wrench to prevent twisting the lines during tightening. For AN fittings see AN specifications. Do not overtighten.
2

Fuel Vapor Canister Mounting Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9.5 N·m)
Important Notes
Ensure canister is properly aligned before tightening. Do not overtighten.

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 specification ensures a proper seal and prevents fuel leaks. Over-tightening can damage the threads or the component itself, leading to leaks or component failure. Under-tightening can also cause leaks, which are a significant fire hazard. For example, if the fuel rail bolts are not torqued correctly, it can cause leaks at the fuel injector seals.

Q2

What happens if I over-tighten fuel system bolts?

Over-tightening can strip threads in the component or the engine, deform sealing surfaces, or even crack the fuel component itself. This could result in fuel leaks, requiring costly repairs and possibly create a dangerous situation. For instance, over-torquing the fuel pump mounting bolts could damage the pump housing or the fuel tank.

Q3

Can I use threadlocker on fuel system bolts?

Generally, threadlocker is not recommended on fuel system fittings and bolts unless specifically stated by the manufacturer. Threadlocker can react with certain fuels or sealants and cause problems. Also, using threadlocker could alter the torque values. It is best practice to only use torque values as directed and always replace O-rings and gaskets. Check the service manual or repair documentation.

Q4

Where can I find the specific fuel bolt torque specifications for my 1993-1997 Chrysler Concorde?

The most reliable source for torque specifications is the official Chrysler service manual for your specific year model. Other resources could include a reputable repair database, and online forums from reputable sources. Do not rely on unverified online sources. The specific torque figures will vary for each individual bolt, whether it be the fuel rail, fuel injectors or other part in the system.

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 calibrated torque wrench is essential for tightening fuel system components to the correct specification to prevent leaks and damage.

  • Accurate torque settings
  • Various drive sizes (3/8", 1/2")
Learn more

Socket Set

A set of sockets in various sizes to fit the fuel component fasteners.

  • Metric sizes
  • Standard sizes
  • 6-point and 12-point options
Learn more
Service Procedures

Fuel Rail Bolt Torque Specification

This procedure outlines the correct torque specification for the fuel rail bolts on 1993-1997 Chrysler Concordes. Improper torque can lead to fuel leaks and potential fire hazards. Always consult your specific service manual for the most accurate information.

  • Locate the fuel rail bolts.
  • Using a torque wrench and the correct size socket, tighten the bolts to the specified torque of 20 ft-lbs (27 Nm).
  • Tighten the bolts in a cross pattern to ensure even pressure.
View full procedure

Fuel Line Fitting Torque Specification

This procedure outlines the correct torque specification for fuel line fittings. It is important to avoid overtightening, which can damage the fittings and cause leaks. Always consult your specific service manual for the most accurate information.

  • Locate the fuel line fittings.
  • Using a torque wrench and the correct size wrench, tighten the fittings to the specified torque of 12 ft-lbs (16 Nm).
  • Ensure no leaks are present after tightening.
View full procedure
Technical Service Bulletins

Fuel Rail Bolt Retorque Recommendation

1998-01-15

Technical Bulletin regarding possible fuel rail bolt loosening over time on earlier 1993-1995 Chrysler Concorde models. Retorque check recommended at 50,000 mile intervals.

1993-1995

Resolution: Retorque fuel rail bolts to the specified 20 ft-lbs (27 Nm) using a cross-tightening pattern at 50,000 mile intervals.

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.

Facebook Contact
15+ Years
Experience
500+ Guides
Guides
50+ Makes
Vehicles
1000+ Solutions
Solutions

Diagnostic

Specialized in advanced diagnostic techniques using modern scan tools and oscilloscopes.

Repair

Expert in both traditional mechanical repairs and modern vehicle systems.

Additional Expertise

Documentation

Created over 500 detailed repair guides and technical documents.

Training

Conducted technical training sessions and contributed to repair databases.

Certifications & Research

Certifications

  • ASE Master Technician Certification
  • Advanced Diagnostic Specialist
  • Hybrid/Electric Vehicle Systems
  • Performance Tuning Expert

Research & Community

Actively researches emerging technologies and contributes to automotive forums.

Legal Disclaimer

Important information about using this content

Always refer to your vehicle's service manual and take appropriate safety precautions when performing any maintenance or repairs.

General Information
The information provided on this website is for general informational purposes only. While we strive to maintain accuracy in our content, all specifications, procedures, and technical information should be verified against your vehicle's official service manual or with the manufacturer directly.
Warranty & Liability

The content on this website is provided "as is" without any representations or warranties, express or implied. We make no representations or warranties regarding the accuracy, completeness, or availability of the information.

We shall not be liable for any direct, indirect, special, or consequential damages arising from the use of information on this website.

Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
  • Vehicle specifications and procedures may vary by model year, trim level, and region.
  • Always follow the manufacturer's recommended procedures and safety precautions.
  • Working on vehicles can be dangerous. Always take proper safety precautions and use appropriate safety equipment.
  • If you're unsure about any procedure, consult a qualified professional mechanic.
Intellectual Property
All content, including text, images, and specifications, is protected by copyright and other intellectual property laws. Any unauthorized use or reproduction is prohibited.

© 2025 Chrysler Specs. All rights reserved.

Privacy Policy Terms of Service