Silicone Oil Hoses?

Hi Sean

An experimental can use garden hose if he so wishes.  This however does not suggest that is a good idea.  Best practice is to follow the requirements for certified aircraft that have standards.  The FAA sets the standards for certified aircraft and for aircraft in the Special Light Sport class the standards are under the ASTM F37 industry standards for this class of aircraft.  

I know that you argue a lot about not following such standards and for your aircraft and as an experimental thats just fine.  Everyone should look at what his airworthiness requirements are based on where he flys and the regulations, if any, he must comply with.  I know that many inspectors, even when signing off an experimental in the USA, will not say the aircraft is airworthy unless it meets at least some basic safety rules.  If you can sign off your own aircraft then you are golden and can do what you want.  I know Roger and am pretty sure he would not sign off on an engine if there was any perceived risks.  

So back to the original question, the answer is no, do not use silicone hoses for fuel or oil as they are not compatible at a molecular level.  They will likely fail.  While very good with coolants I would never recommend them as an oil line. 

Check it out online, there are lots of hose suppliers and the answer the same. 

Cheers

I fully agree with RW. I don't use aftermarket parts and it doesn't leave my shop with below average work. Plus silicone and Teflon hoses are quite expensive. I know a few who did install Teflon hoses for their` oil and fuel and it was around $2400.

Like RW stated. I would HIGHLY recommend everyone put fuel and oil hoses in fire sleeve. I'm a retired 30 year firefighter and can tell you exactly what happens in the engine area with a fire and especially when it ignites the fuel and oil.

Hi RW,

This all said I just did a search and there are a couple of companies that sell silicone hose for fuel and oil. I was a little surprised and some were okay with the FAA.

Aircraft Specialty uses Teflon. 

Liability and injury,  neither are worth the risk.

Hey Roger

Teflon inner liners are fine, the issue is silicone hoses are not good with any type of solvents.  Most oil lines would need to have an inner sleeve to protect them if used with oil.  Silicone outer on a fuel line may work but it would need a liner for sure. 

There are some special hoses with "fluorocarbon and fluorosilicone liners, this may be where the confusion comes from.

Cheers

https://www.siliconehose.com/blog/oil-fuel-and-silicone-hoses-/?srsltid=AfmBOoqR8TXM8Of7uBc7IW4_Uc98fgrNKtxG8Dd_IU8HGcGIXuA9oQAR