Fuel & Oil Line Fittings
The Fuel & Oil Line Fittings category groups AN-based connectors for building fuel and oil plumbing, split by hose type and assembly method. If you want to tighten without twisting the hose, start with Swivel AN Fittings.
For PTFE (Teflon)-lined setups, use PTFE (Teflon) Fuel & Oil Line Fittings, while quick, service-friendly routing with rubber/nylon hose is covered under Push-On Fuel & Oil Line Fittings. Filter by size and angle, open the product card to confirm threads and compatibility, then place your order.
Fuel & Oil Line Fittings – AN connectors for tidy routing, reliable sealing and easier servicing
This category brings together AN-style fittings and hose ends used to assemble fuel and oil lines with a predictable sealing method and cleaner packaging. The goal is a routing layout that stays serviceable, reduces hose strain at junctions and helps you spot issues early.
You’ll commonly see swivel designs plus straight, 45° and 90° options, with sizes referenced in names (often AN-4 to AN-12, depending on type). Across the subcategories, listings are led by TurboWorks, with Aeromotive and DeatschWerks also appearing on relevant hose-end ranges.
Selection starts with the hose: what works for rubber/nylon is not the same as what’s required for PTFE (Teflon) liner systems. On fuel lines, always finish with a careful leak check and secure the line so vibration loads the chassis, not the fitting.
Technical Basics
AN connections typically seal on a 37° flare/cone surface rather than the threads. That’s why clean, undamaged mating faces and the correct counterpart matter more than thread tape tricks, which generally don’t solve flare sealing.
PTFE (Teflon) hose behaves differently from rubber/CPE hose, so you often need dedicated hose ends and olive inserts (where specified) to support the liner and prevent weeping. Material choice and the assembly method are the reliability drivers here.
If you’re building workshop-grade, repeatable assemblies with proper tooling, Crimp-On AN Connectors for PTFE (Teflon) Hose are designed around permanent retention using a hydraulic crimper. In that case, hose construction and crimp diameter requirements are compatibility-critical, so confirm the exact designation on the product card.
Selection Criteria
Start with system interfaces: matching the AN size (for example AN-6, AN-8, AN-10) to your ports helps you avoid stacking adapters and extra leak points. If a title includes a thread call-out such as NPT, treat it as non-negotiable and verify the mating port before ordering.
Choose geometry to protect the hose: 45° and 90° elbows can prevent tight bends and reduce side-load at the joint. Swivel nuts help you clock the final position without twisting the hose, which is especially useful in tight bays.
Where you need a specific hose-end assembly concept and thread transition, Cutter Style AN Fittings should be selected by exact angle, AN size and the “other side” thread. Avoid “almost fits” threads—measure and match the specification.
Installation & Maintenance
Installation quality is mostly preparation: square cuts, clean parts and tightening without twisting the hose. After first start-up, re-check joints at operating temperature and inspect routing points for chafe and movement.
For a neat hose termination and easier handling, Fuel & Oil Hose Finisher Clamps (Finisher Clamp) are listed for rubber and nylon hoses, using AN-4–AN-10 sizing and an ID (mm) call-out in the name. Only use them with PTFE if the specific product explicitly states compatibility.
For ongoing checks, look for dampness, odour and staining at joints, and inspect the sealing seat and threads if you regularly disassemble the system. Most long-term issues start with poor support or overly tight bends rather than the fitting itself.
FAQ
AN-6 vs AN-8: which size should I run for fuel?
Choose based on your component ports and hose specification: the right size is the one that matches your pump/filter/regulator interfaces. Bigger is not automatically better if it forces more adapters and adds leak points. Confirm exact sizing on the product card before ordering.
What’s the difference between push-on and screw-together hose ends?
Push-on fittings require a hose that is specifically rated for push-on/push-lock assembly, while screw-together hose ends use a different retention method. Your hose type (rubber/nylon vs PTFE) and the serviceability you need should drive the decision. Always check the hose data sheet first.
Do I need thread sealant on AN fittings?
On 37° flare AN joints, sealing is typically on the flare surfaces, not the threads, so thread sealant usually doesn’t address the leak path. If the other side is NPT, thread sealing may be appropriate there because it seals on the tapered thread. Verify the sealing method for each interface you’re using.
When should I choose PTFE (Teflon) hose and fittings?
PTFE (Teflon) is often chosen for demanding fluids and environments where low permeation and durability matter. It also requires the correct hose end design and, where specified, olive inserts to support the liner. Select only fittings explicitly intended for PTFE systems.
How can I tell what thread my port uses?
Thread identification needs diameter, pitch and the sealing concept—together they confirm whether it’s NPT, metric or another standard. Many problems come from “nearly compatible” threads that damage seats and weep later. Measure and match the specification before you buy adapters or fittings.
Pick the fitting type that matches your hose and system, confirm markings on the product card, and place your order.
