FUEL LINES

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bluecs

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For stock E9, say 74 with Zenith carburators, fuel lines appear to be 8mm ID and 13mm OD.
If anyone e knows off hand:
Questions are 1. Braided or not? 2. Approximate
Total length to change all the fuel lines?
3. Any brand recommended or to avoid?
 
As you found, the original is 8x13mm and it originally had a black/dark grey braided cloth cover. However, with today’s ethanol laced fuels, it has been recommended that a more modern fuel hose be used. Ethanol can cause the hose to degrade and the cloth hides this.
 
Great information Chris. You guys are the Wikipedia of BMW information. Have a great Thanksgiving.
Thanks
 
Change the steel pipes whilst you are at it, I used copper pipe from Jaymic. However I should have bought some micro bore central heating pipe from a builders or plumbers merchant. It is probably the same stuff but a different price.
To cut the rubber pipe, wrap the cut zone in black electrical tape, use garden shears, then leave the tape on to stop the fibres fraying.
 
SAE spec J30 addresses fuel line materials. Unfortunately they don't give the spec away; you may be able to get it at your local university. When I got in-tank flexible fuel line for my K100RS bike, it had to be SAEJ30R8.

Hemmings https://www.hemmings.com/blog/2014/12/05/tech-101-fuel-line-hose-what-you-should-and-should-not-use/

Standard neoprene fuel hose can be used for fuel, PCV and EEC systems on all vehicles where working pressures are under 50 psi or vacuum ratings are under 24-in. Hg for 7/16-inch and smaller inside-diameter sizes (10-in. Hg for ½-inch diameter hose). Fuel line is a petroleum-resistant nitrile tube with a covering that resists weathering, ozone and heat and can be used for ethanol-laced fuels and diesel fuel. It should, however, not be used on coolant systems, oil systems or fuel-injection systems that produce pressures higher than 50 psi. SAE ratings displayed on the hose should be 30R6 or 30R7.

Cunifer? Tenifer? SS (difficult to work with)?

It would be just like me to overthink this...
 
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