Using PVC tubing to replace vapor recovery lines in 73 911
 

Hey Guys
Any thoughts or experience on replacing the vapor recovery lines in the trunk of a 73 911 with high quality PVC tubing. The 40 year old lines are yellow and brittle to the point of snapping when handled. A little research at the IPEX Plastic Piping site revealed that PVC tubing is resistant to ethanol but has a lower resistance to gasoline. I immersed some tubing in gasoline for a week with no visible deterioration. The two stumbling blocks seem to be PVC deterioration by UV light which is minimized in the dark of the trunk and that the tubing is not recommended for high pressure situations which should not be a concern since the vapor recovery system operates at just above atmospheric pressure.

let me know what you think

John

About 10 years ago, I went to my local hardware store and got a bunch of PVC Tubing and replaced all my lines. so far no problem.

The listed chemical resistance is for the tubing immersed in the material. The vapor is much less corrosive.

There's a wide range of industrial hydraulic hoses. PVC will harden and take a rigid set.

Polyurethane tubing is one option:
https://dpk3n3gg92jwt.cloudfront.net/domains/ryanherco/attachments/965801_PolyurethaneTubing-Tygothane-C210A.pdf

Chemical resistance of plastic tube and hose:
https://www.rhfs.com/assets/pdf/productGuides/Chemical-Resistance-of-Plastic-Tubing-Hose.pdf

Sherwood

Sherwood. Agreed, in theory, there are better types of tubing.

But after 10 years and still ok, everyday PVC Tubing appears to be a good economical choice.

thanks for the help
 

Thanks for the help. You have confirmed what I thought. Time to get this restoration completed and on the market. Will be sad to see my 73 gone!