Does anybody know the source and/or proper name of the used in fuel shutoffs?

It's a lot smaller and softer than typical fuel lines available in the hobby business.

What I see is has a wall thickness of about 1 MM, I.D. of 1 MM, O.D. 3 MM.  The core is white or clear or amber and it has an outer coating of yellow or purple.  By my best reckoning that would be about .118" OD.  It feels like a shore(A) of 40, but I don't have access to a durameter.

I'm trying to rehab an old shutoff on which the tube has worn out.  The tubing needs to be a lot thinner and softer than regular fuel line for these pinchers to work, especally on F2D's which are half the mass of a Fast.

Thanks for the advice.

I ordered some specimons from both GRS and 4Fishin'.

Will report findings. 

I have small samples of black, yellow, and purple tube in hand, but as yet I hadn't been able to backtrack the sources

MBS Model Supply has the tubing mentioned.  I think I sold it to you at the NATS one year.  DOC Holliday

Tom Siegler.

Are you looking for bladder tubing or line that is soft enough for a pinch off? 

He has some real soft stuff he used for fuel line.  He got it from from some obscure source.  It is black.   It works a lot better than the windsheild wiper tubing I am using. 

He also has the red jacked stuff for bladders and the real thin black stuff for  low pressure 1/2a bladders.  He is going to an F2d contest in germany next week so get a hold of him now. 

Dave

I got my samples from  www.4fishin.com.

The 3/32" ID (ST-332-5) is OK for current shutoffs.

The 1/8" ID (ST-18-5) is too big for current shutoffs, but might work well in a bigger-bore shutoof and would be easirer to handle.

3/8" ID (ST-38-5) is too big for any modeling application, including bladders. Maybe a big slingshot or an exercise device.