Best fuel lines and fittings on the market
Juan, Thank you so much for your support. Looking forward to seeing the project once you finish!
Didn’t get to select L or R side when ordering.
Didn’t get to select L or R side when ordering.
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Free Shipping $99+
Lifetime Warranty
Expert Support
Lifetime Warranty
Free Shipping $99+ (USA)
Real Expert Support
Hard line tube fittings to AN Male fittings
$13.99
Free Shipping $99+
Lifetime Warranty
Expert Support
Reliable shipping
Hardline Tube to AN Male Adapters
Adapt factory hardlines to AN fittings for clean, leak-free fuel systems. Works with 1/4", 5/16", 3/8", and 1/2" hardline. Rated to 250 PSI when properly installed.
- Convert OEM hardlines to AN in minutes—no guesswork, no cobbled adapters.
- Perfect for EFI conversions, LS/LT swaps, and fresh fuel plumbing.
- Clean, serviceable connections that pair with Hot Rod AN PTFE hose and fittings.
- Common hardline sizes supported: 1/4", 5/16", 3/8", 1/2".
- Pressure rating: up to 250 PSI when properly installed.
Where these adapters shine
- Fuel sending unit outlets to AN for modern hose routing.
- Factory feed/return lines to AN when upgrading to PTFE hose.
- Carb-to-EFI conversions (regulator, filter, return line updates).
- LS/LT swaps: integrate OEM truck/car hardlines with AN systems.
- External fuel filter/regulator installs with Hardline smooth tube for rubber hose
Specs
| Hardline sizes | 1/4", 5/16", 3/8", 1/2" |
| Outlet | AN male (select size in options) |
| Pressure | Up to 250 PSI (proper install required) |
| Primary use | Fuel system plumbing |
Install tips:
- Measure hardline OD (outside diameter) and select the matching adapter.
- Cut the tube square and de-burr inside and outside (critical for sealing).
- Follow the adapter’s assembly order (nut/sleeve/compression as applicable) and tighten per spec.
- After assembly, pressure-test the system before driving.
Important: For fuel system use only. Not for brake lines or power steering.
Lifetime Warranty
Free Shipping $99+ (USA)
Real Expert Support
FAQs
How do I pick the right size?
Match the adapter to your hardline’s measured OD (1/4", 5/16", 3/8", or 1/2"). Then select the AN outlet size to fit your hose/fitting system.
Will this work for an LS swap?
Yes—these are ideal for connecting OEM hardlines to AN for modern fuel systems. For a complete plumbing solution, see our LS swap fuel line kits.
What pressure can it handle?
Up to 250 PSI when properly installed and verified by a pressure test.
What hose should I pair with this?
Use Hot Rod AN PTFE hose bundles and AN hose ends for a complete, ethanol-compatible EFI setup.
Any installation cautions?
Always cut/deburr properly, assemble in the correct order, tighten to spec, and pressure-test. Do not use for brake or power steering circuits.
Warranty
Backed by our lifetime warranty against manufacturing defects. Contact support with your order number and photos for a quick resolution.
Shipping
Fast shipping from the USA. Free shipping on orders $99+ (USA). Rates and options shown at checkout.
Returns
Hassle-free returns on new, unused items in original packaging per our Returns Policy.
Quality
Purpose-built for fuel system use and designed to pair with Hot Rod AN PTFE hose and AN fittings for leak-free performance.