Fuel Lines can be made from many different materials. If you plan to race, be sure to check the rule book for your track or sanctioning body. Using the right material the first time will save you time, money, and headaches.
Metal Lines
Most cars come from the factory with Metal Lines because they hold up better than any soft material. They are usually made from stainless, aluminum or coated steel tube. Metal is the best material for fuel lines. However, it can be difficult to fabricate.
Rubber Hose
Rubber fuel hose is easy to install. It is typically connected using standard barbed fittings and Fuel Line Hose Clamps. It must be rated for fuel or be labeled as meeting one of the following SAE grades:
- SAE J30R7 is carburetor rated fuel hose and should only be used in limited runs up to 50 psi.
- SAE J30R9 is fuel Injection rated fuel hose which can handle up to 100 PSI.
While easy to install, rubber hose has some downsides and shouldn’t be used to plumb an entire fuel system:
- It starts degrading as soon as fuel hits it.
- With the exception J30R9 rated hose, it will leak fuel vapors which can leave your garage or vehicle smelling like raw fuel.
- It’s susceptible to cuts, nicks and other abrasions.
For fuel line repairs on a budget, Nylon Tubing may be a better option than long lengths of plain rubber fuel hose.
Braided Rubber Hose
Braided Hose is rubber hose with either a braided stainless or braided nylon exterior. It uses AN Hose Ends to connect with the rest of the fuel system. While more durable than plain rubber hose, it still has similar issues with long term durability and fuel vapors.
PTFE Lined Hose
PTFE Lined Hose is the best soft hose you can use and generally has a braided stainless or braided nylon exterior. The PTFE liner blocks fuel vapors and slows the degradation process. PTFE Braided Hoses require Special Fittings. You cannot use a standard AN fitting with this hose. It’s also less flexible than standard braided or rubber hose.
