Best Metric to AN Adapters for GM TBI and Vortec Fuel Systems
When upgrading fuel lines or converting GM fuel sending units to AN fittings, choosing the right metric-to-AN adapters is essential for reliability and performance. The following selections cover common conversions, from M16 x 1.5 to -6AN feed lines to M14 x 1.5 return lines, plus stainless steel and aluminum options designed for high-pressure use. Each product is evaluated for compatibility, sealing method, and durability to help you pick the best fit for LS swaps, fuel rails, and brake line connections.
| Product | Brand | Key Benefit | Best For |
|---|---|---|---|
| 6AN Adapter Fitting Set Compatible With GM TBI Style (metric O-ring) Fuel Sending Units – 47-0001 Black | Jetuplusllc | Black anodized, metric O-ring seal | LS swaps and feed/return conversions |
| EVIL ENERGY 6AN Male Flare to M10 x 1.0mm Male Metric Fitting Adapter Aluminium Alloy 2PCS | EVIL ENERGY | Dual 6AN to metric with o-ring seal | Compact metric-to-AN connections |
| 6AN Adapter Fitting Set Compatible with GM TBI Style (metric O-ring) Fuel Sending Units – 47-0001 Silver | Jetuplusllc | Silver anodized finish, metric O-ring | LS swap and Vortec setups |
| Podavelle 3AN Male to M10x1.0 Metric Inverted Flare Female Brake Line Adapter Fitting Stainless Steel | Podavelle | 304 stainless steel, high durability | Brake lines and stainless braided hoses |
| EVIL ENERGY 6AN Male Flare to M14 x 1.5mm Male Metric Fitting Adapter Aluminium Alloy 2PCS | EVIL ENERGY | M14 metric side, strong seal | Heavy-duty metric-to-6AN connections |
6AN Adapter Fitting Set For GM TBI Style (Metric O-Ring) Black
This adapter set is designed to convert GM TBI style fuel sending units and some Vortec systems to AN fittings. It supports an LS swap through a feed-side M16 x 1.5 to -6AN transition and a return-side M14 x 1.5 to 6AN conversion, all with a black anodized finish for corrosion resistance and a metric O-ring seal for a reliable, leak-proof connection.
EVIL ENERGY 6AN Male Flare to M10 x 1.0mm Male Metric Fitting, 2PCS
This set features a 6AN male flare to M10 x 1.0mm metric thread with a 37-degree sealing face and an o-ring on the metric side. With a working pressure rating around 1500 PSI and a wide operating temperature range, these adapters deliver solid performance for metric-to-AN connections without sacrificing space or ease of installation.
6AN Adapter Set for GM TBI Style (Metric O-Ring) Silver
Similar to the black variant, this silver version is optimized for GM TBI and Vortec fuel sending units, enabling precise connections from M16 x 1.5 to -6AN feed lines and M14 x 1.5 to 6AN return lines. The silver anodized finish offers a distinctive look alongside durable corrosion resistance.
Podavelle 3AN Male to M10x1.0 Metric Inverted Flare
Podavelle’s stainless steel adapter converts from AN3 male to M10-1.0 inverted flare female. Constructed from 304 stainless steel, it suits connections between stainless braided hoses and stock or upgraded brake components. A machined groove accommodates a retainer clip for a secure fit in high-vibration environments.
EVIL ENERGY 6AN Male Flare to M14 x 1.5mm
This adapter matches a 6AN flare with a metric M14 x 1.5mm thread. It’s sealed with a 37-degree flare on the AN side and an o-ring on the metric side, designed for high-pressure fuel systems. Its aluminum alloy construction balances light weight with durability for frequent servicing or tinkering on performance builds.
EVIL ENERGY 6AN to M14 x 1.5mm Metric Fitting (1PC)
Offering a single 6AN to M14 x 1.5mm metric connection, this adapter uses a 37-degree sealing angle on the AN side and an o-ring seal on the metric side. With a working pressure of up to 1500 PSI and a wide temperature range, it’s a robust option for high-performance fuel lines and race-oriented builds.
Buying Guide
- Seal type and compatibility: Look for adapters with o-ring seals on the metric side and 37-degree flare seals on the AN side to minimize leaks under high pressure.
- Material and finish: Aluminum alloy fittings are lightweight and corrosion resistant; stainless steel variants resist corrosion in harsh environments but may be heavier.
- Thread compatibility: Confirm metric side dimensions (M10, M14, M16) and AN size (commonly -6AN) to ensure a proper match with your hoses, sending units, and fuel rails.
- Durability under temperature and pressure: Choose products with high working pressure ratings (around 1500 PSI or more) and wide operating temperature ranges for reliability in performance applications.
- Application fit: Consider whether the adapter is meant for fuel lines, brake lines, or a combination, as some models are optimized for stainless steel lines or stock-to-upgraded components.
- Installation practicality: Hex-shaped bodies and clear thread engagement help ensure a secure, wrench-friendly install without cross-threading.
- Aesthetic considerations: Finishes such as black or silver anodized coatings help resist corrosion and match other components in your engine bay.
- Warranty and compatibility notes: Review product descriptions for compatibility with GM TBI, Vortec, LS swaps, and other common configurations to avoid misfit issues.