fuel line 912

by anthony grantham in General Tech Discussion 8 years ago

can automotive type fuel line be used with the 912 fuel system?
there are 2 different sizes of lines used,one to the pump
and a different size between fittings ,what is the correct descriptive
size,or sizes ,i am looking to replace my fuel lines but am unsure of the above and
there is an array of fuel line available on ebay,stating alcohol friendly
(like me) also some high pressure,some stainless braided ,so many choices
so is fuel line fuel line or are there aircraft spec's to adhere to
thanks 912 uls MTO Sport Gyro

Re: fuel line 912

by Roger Lee » 8 years ago

Roger Lee

125 5.11k 4.52k

Hi Anthony,

Here is your general answer:
Use 5/16" (8mm) up to the pump for your supply hose from the tank. Use 1/4" (6.5mm) from pump bottom pressure outlet to the fuel distribution block on the cross over or balance tube between carbs. If your engine has the red teflon hose from Rotax then leave it. If it is just rubber hose use the 1/4" from the distribution block to the carbs.
You can buy your rubber fuel hose locally.

But,

Read this blog and some questions may be answered and maybe some you didn't think of.

http://www.rotax-owner.com/en/rotax-blog/item/21-rotax-5-year-rubber-replacement-the-installation-considerations

Most all hose now days is rated for ethanol fuel or all our cars would be sitting on the side of the road. Some hoses are more vapor permeable. Me personally, I prefer gates Barricade fuel hose as it is far less permeable. Since rubber technically isn't supposed to be used over a barbed fitting (which 90% of the light aircraft planes are using) you need to be careful when you install rubber hoses. Do not use fuel injection hose. It is rated for high pressure and when sliding it over a fitting it has no give and carries a much higher incident of scraping off the inner liner and causing debris. Use hose that is rated for carburetors. Fuel Injection hose is usually rated to about 100 psi and carburation hose is rated to 50 psi which is plenty for us. The carburation hose has some give and is less likely to shear off the inner liner. I also never slide the hose on over a fitting dry. Use a very sharp knife like edge to cut the hose. Any serrated surface will leave minute hose pieces on the edge which in turn get sheared off during the installation. After you slide the hose through the fire sleeve make sure you blow the hose out. Use the proper clamps and not the garden hose serrated worm drive clamps. DO NOT over tighten your clamps which can be a big problem because the barbs can cut into the rubber hose. It only needs to be snug enough to keep it from leaking and or sliding off.

p.s.
I just saw you live in Australia so I'm not sure what you have at your local automotive stores, but it won't hurt to look.

Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell

Thank you said by: Greg Dawson-Sheehan, Matia F

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fuel line 912

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