Subaru Subaru Outback 2015-2019 Fuel System Bolt Torque Specifications & Line Fittings
Subaru Subaru Outback 2015-2019

Subaru Subaru Outback 2015-2019 Fuel System Bolt Torque Specifications

Detailed torque specifications and guidelines for the fuel system bolts on the 2015-2019 Subaru Outback, including fuel pump, fuel rail, 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 Delivery

Components responsible for delivering fuel from the tank to the engine, including the fuel rail, injectors, and pressure regulator.

1

Fuel Rail Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Ensure bolts are tightened in a crisscross pattern to evenly distribute pressure.
2

Fuel Injector Bolts

M6 x 1.0
Torque Value
14 ft-lbs (19 N·m)
Important Notes
Ensure injectors are properly seated before tightening.
3

Fuel Pressure Regulator Bolts

M6 x 1.0
Torque Value
8 ft-lbs (11 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system.

Fuel Storage

Components responsible for storing and securing fuel, including the fuel tank, straps, and filler neck.

1

Fuel Pump Mounting Bolts

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Ensure the fuel pump is properly seated in the tank before tightening.
2

Fuel Tank Strap Bolts

M10 x 1.5
Torque Value
33 ft-lbs (45 N·m)
Important Notes
Ensure the fuel tank is properly aligned before tightening.
3

Fuel Filler Neck Bolts

M6 x 1.0
Torque Value
7 ft-lbs (9 N·m)
Important Notes
Ensure the filler neck is properly aligned with the fuel tank.
4

Fuel Tank Sender Unit Bolts

M6 x 1.0
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Estimated value based on similar M6 bolts in the fuel system.

Fuel Filtration

Components responsible for filtering fuel, including the fuel filter and its housing.

1

Fuel Filter Bolt/Nut

M8 x 1.25
Torque Value
17 ft-lbs (23 N·m)
Important Notes
Ensure the fuel filter is properly seated in the housing.

Fuel Lines

Components responsible for connecting fuel lines to various parts of the fuel system.

1

Fuel Line Fittings

M8 x 1.25
Torque Value
15 ft-lbs (20 N·m)
Important Notes
Estimated value based on similar M8 fittings in the fuel system.

Fuel Cap

Component responsible for sealing the fuel filler neck.

1

Fuel Cap

N/A
Torque Value
0 ft-lbs (0 N·m)
Important Notes
Hand-tighten only. Do not over-tighten.

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 torque specification for the fuel line bolts on a 2015-2019 Subaru Outback?

The torque specification for the fuel line bolts on a 2015-2019 Subaru Outback is typically 14.5 ft-lbs (19.6 Nm). Always refer to the vehicle's service manual for the exact specifications, as variations may exist depending on the specific model and engine type.

Q2

Can I reuse the fuel line bolts after removal?

It is generally recommended to replace the fuel line bolts after removal, as they are designed to be single-use components. Reusing them can compromise the integrity of the fuel system and lead to leaks or other safety hazards.

Q3

What should I do if I over-torque the fuel line bolts?

If you over-torque the fuel line bolts, you risk damaging the threads or the fuel line itself. Immediately stop and inspect the component for damage. If any damage is found, replace the affected parts and ensure the new bolts are torqued to the correct specification.

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 specialized tool for safely disconnecting fuel lines without damaging the connectors.

  • Compatible with Subaru fuel line connectors
  • Ergonomic design for ease of use
Learn more

Socket Set

A set of sockets in various sizes, including those required for fuel system components.

  • Includes 10mm and 12mm sockets
  • Durable construction
Learn more
Service Procedures

Fuel Pump Replacement Torque Specifications

Detailed steps for replacing the fuel pump and applying the correct torque to the fuel system bolts.

  • Disconnect the negative battery terminal.
  • Remove the rear seat cushion to access the fuel pump assembly.
  • Disconnect the fuel lines using a fuel line disconnect tool.
  • Remove the fuel pump assembly mounting bolts.
  • Install the new fuel pump assembly and tighten the mounting bolts to 7.5 Nm (65 in-lbs).
  • Reconnect the fuel lines and ensure they are securely fastened.
  • Reinstall the rear seat cushion and reconnect the battery terminal.
View full procedure

Fuel Rail Bolt Torque Specifications

Procedure for removing and reinstalling the fuel rail with proper torque application.

  • Relieve fuel system pressure by disconnecting the fuel pump relay and running the engine until it stalls.
  • Disconnect the fuel lines from the fuel rail.
  • Remove the fuel rail mounting bolts.
  • Install the fuel rail and tighten the mounting bolts to 22 Nm (16 ft-lbs).
  • Reconnect the fuel lines and ensure they are securely fastened.
  • Reconnect the fuel pump relay and start the engine to check for leaks.
View full procedure
Technical Service Bulletins

Fuel System Bolt Torque Specification Update

2017-05-15

Updated torque specifications for fuel system bolts to prevent leaks and ensure proper sealing.

2015-2019 Subaru Outback

Resolution: Apply updated torque specifications as outlined in the service manual.

Fuel Pump Assembly Bolt Inspection

2018-08-22

Inspection and retorque procedure for fuel pump assembly bolts to address potential loosening issues.

2015-2019 Subaru Outback

Resolution: Inspect fuel pump assembly bolts and retorque to 7.5 Nm (65 in-lbs) 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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Technical Information
  • All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
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