flex fuel lines

[Jack]

Is it possible for flex fuel line to allow gas smells to emanate through the rubber? I know that Ethanol eats away at rubber and has other advirse effects on it. appreciate any feedback.

[tirod]

Yes. If it's the old school non carbureted low pressure hose, it's not modern fuel resistant. And that includes AN hose that doesn't have a Teflon liner.

The new hose standard is low vapor. The EPA and SAE made a change to teflonized inner liner hose because the old stuff will evaporate gallons of fuel a year. Making it vapor resistant not only cuts down on the inner liner deteriorating from alcohol contamination and the 20 additives used in all the regional blends, it cuts down the smell a lot, too.

In actual practice, the factories actually use very little flexible rubber hose, they've pretty much gone to nylon tubing. Most of the fuel line is either nylon or metal. It's much less expensive, has all the pressure resistance needed, and on the assembly line, is more easily handled than a 20 foot piece of rubber line snaking all over the chassis. Plus - it won't rot and leak. Cars tend to get ignored and usually have no mandatory replacement schedules for fuel lines.

Race cars and aircraft do.

[Jack]

Yes. If it's the old school non carbureted low pressure hose, it's not modern fuel resistant. And that includes AN hose that doesn't have a Teflon liner.

The new hose standard is low vapor. The EPA and SAE made a change to teflonized inner liner hose because the old stuff will evaporate gallons of fuel a year. Making it vapor resistant not only cuts down on the inner liner deteriorating from alcohol contamination and the 20 additives used in all the regional blends, it cuts down the smell a lot, too.

In actual practice, the factories actually use very little flexible rubber hose, they've pretty much gone to nylon tubing. Most of the fuel line is either nylon or metal. It's much less expensive, has all the pressure resistance needed, and on the assembly line, is more easily handled than a 20 foot piece of rubber line snaking all over the chassis. Plus - it won't rot and leak. Cars tend to get ignored and usually have no mandatory replacement schedules for fuel lines.

Race cars and aircraft do.

Thank you for your very informitive post!!!!!!!!!!!!!

[Tony Zullo]

Fyi guys i always use aluminum tubing it works great and easy to use and bend around things with ease you can get it from summit racing and its pretty cheap! Tony@ffr