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labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM

labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM is a CNC-machined 6061-T6 aluminum fuel line adapter priced at $11.56. It connects -6AN to 5/16 in GM LS EFI systems, ideal for high-performance fuel upgrades and aftermarket installations requiring reliable, corrosion-resistant fittings.

$11.56

● In stock

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Price and availability may change. Click to see current details on Lab Work Auto.

Key features

  • CNC machined 6061-T6 aluminum
  • Black anodized corrosion-resistant finish
  • Converts -6AN to GM 5/16 quick connect
  • Straight fitting angle for inline use
  • Compatible with LS EFI GM engines
  • Suitable for fuel, oil, and coolant
  • Male threaded for secure installation

Pros

  • +Durable aluminum construction
  • +Resists corrosion and high pressure
  • +Clean OEM-style integration
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Cons

  • No installation instructions included
  • Requires professional-level mechanical skill

About labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM

What is labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM?

This labwork fuel adapter is a precision-engineered component designed to bridge modern -6AN fuel systems with factory 5/16-inch GM quick-connect hardlines. Machined from 6061-T6 aluminum and finished in durable black anodizing, it ensures compatibility with LS-based EFI platforms. Ideal for engine swaps, performance builds, or replacing worn OEM connectors, this straight-thread adapter delivers a secure, leak-resistant connection for gasoline and compatible fluids. Sold individually by Lab Work Auto, it supports clean integration of aftermarket fuel rails or lines into stock GM fuel systems.

Key features

  • Material — CNC machined from high-strength 6061-T6 aluminum.
  • Finish — Black anodized for corrosion resistance and visual appeal.
  • Connection Type — Converts -6AN male to GM 5/16 quick connect with female thread.
  • Fitting Angle — Straight design for direct inline installation.
  • Compatibility — Designed for GM LS EFI engines and factory hardline systems.
  • Fluid Compatibility — Suitable for fuel, oil, coolant, and other automotive fluids.
  • Thread Type — Features standard male thread for secure mounting.

Who is labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM for?

This adapter serves DIY automotive enthusiasts, hot rodders, and performance mechanics working on LS engine swaps or fuel system upgrades. It's especially useful when integrating aftermarket fuel rails with stock GM fuel lines. Ideal for users with intermediate mechanical skills who value clean, reliable connections in tight engine bays. Not recommended for beginners due to lack of installation instructions.

How does labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM compare?

Compared to standard polypropylene or rubber connectors, this aluminum adapter offers superior durability and heat resistance. It outperforms OEM plastic quick-connects in high-pressure or high-temperature environments. Unlike universal hose adapters, it provides a direct, no-modification fit for GM LS platforms. When compared to steel fittings, it resists corrosion better and adds a custom aesthetic with its black anodized finish.

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Best use cases

  • LS engine swaps in classic cars
  • Upgrading stock fuel lines to -6AN
  • Replacing worn GM quick-connect fittings
  • Performance fuel system builds
  • Custom EFI fuel rail installations
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Is labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM right for you?

This adapter is best for intermediate to advanced automotive enthusiasts performing LS engine swaps or fuel system upgrades. It requires knowledge of fuel system safety and proper installation techniques. If you're working with GM EFI platforms and need to connect aftermarket -6AN lines to stock 5/16 hardlines, this is a reliable choice. For simpler applications, consider pre-assembled hose kits or OEM replacement connectors.

How it compares: Compared to plastic quick-connects, this aluminum adapter offers better durability and heat resistance. It provides a more permanent solution than universal hose fittings and integrates cleaner than adapter blocks in LS swap applications.

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Frequently Asked Questions

What does the labwork 6AN fuel adapter do?

It connects a -6AN fuel line to a factory 5/16-inch GM quick-connect hardline on LS-based EFI engines, enabling seamless integration of aftermarket fuel systems with OEM components.

Does this adapter fit all GM engines?

It is specifically designed for GM LS series engines with 5/16 quick-connect fuel lines. It may not fit older carbureted or non-LS EFI systems without modification.

How is the adapter finished?

The adapter is black anodized, providing a durable, corrosion-resistant surface that maintains appearance under hood heat and exposure.

Is professional installation required?

Yes, professional installation is recommended due to fuel system safety risks. The adapter requires proper torque and alignment to prevent leaks.

Can this be used for diesel applications?

It is suitable for diesel fuel if used within pressure and compatibility limits. Confirm with your system’s specifications before use.

How much does labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM cost?

labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM is $11.56 at Lab Work Auto. Prices may change — click through to Lab Work Auto for the latest.

Is labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM in stock at Lab Work Auto?

Yes, labwork 6AN Fuel Adapter For 5/16 Quick Connect W/Thread Female LS EFI BLACK GM is currently in stock at Lab Work Auto.

Specifications

SKU
F8-016707
Last updated May 14, 2026