How to Install AN PTFE Hose and Fittings
Whether you're a hobbyist upgrading your fuel lines or a pro working on EFI conversions, LS swaps, or custom AN plumbing, this guide will walk you through the installation of AN PTFE hose ends with precision and reliability. Our step-by-step tutorial ensures a leak-free result for fuel systems, transmission lines, and more.
Step 1: Measure Twice and Cut Once
Use string or lay the hose out to get an accurate measurement for your project. Leave a few extra inches for layout changes. Be sure to consider the correct bend radius.
Step 2: Cut Your AN PTFE Hose
Use AN Hose Cutting Shears for a clean, straight cut. Wrap the hose with masking tape before cutting to prevent fraying.
Step 3: Slide On the Nut
Slide the nut over the hose with threads facing forward. Use vice jaws to assist with the braiding. Place the nut in vice jaws and twist the hose into it as if threaded.
Step 4: Flare the Braid and Insert the Ferrule
Carefully flare the stainless braid and insert the ferrule over the PTFE liner, under the braid. Trim nylon as needed to ease fitting installation and protect threads.
Step 5: Insert the Fitting
Lubricate the barb and insert the fitting into the hose. Ensure it fully seats into the ferrule.
Step 6: Tighten the Assembly
Thread the nut onto the fitting by hand. Use an AN wrench and vice jaws to tighten until about a 1mm gap remains.
Step 7: Test for Leaks
Cap one end and pressure test the hose. Use soapy water or submerge it to check for leaks. Bubbles may appear from the swivel pin, which is not a leak.
Tips for Easier Assembly
- Always use light lubricant on fittings before insertion.
- Use tape generously to keep braid from flaring.
- Use proper tools like hose shears and vice jaws to avoid damaging the hose or fittings.
- Replace ferrules when reusing fittings.
- Inspect and pressure test every line after assembly.
Need Help or Want a Custom Build?
Have questions or want help with a complete fuel or transmission line system? We're here to help!
Looking for a tailored solution for your build? Use our Build Request Form to get a custom hose and fitting layout for your EFI, LS swap, carbureted build, or AN plumbing project.