Hi guys, R9 hose is for fuel injection really and I found the OD to be too big for my mechanical fuel pump connections. To meet the SAE J30 R9 spec it is reinforced for FI pressures usually meaning the acceptable bend radius is bigger, making it harder to route.
I used a combination of 6mm stainless steel pipe and Cohline 5.6mm ID 100% biofuel hose from ASF a few years ago and it's still fine now. The Cohline hose is for low pressure use so is fine for VW gravity fed systems and has a fairly tight bend radius. That said, I'll probably change it soon anyway as I don't like to wait for leaks or cracks.
Barricade had just come out then and was not readily available. I'd be interested to know the ID and OD of the barricade hose that some of you guys have used, also what fuel pump/carb you have fitted.
Don't forget, whatever hose you fit it won't last forever. The hose will deteriorate from extremes of heat, cold, fumes, contact with chemicals and mechanical abrasion. Check it regularly and replace as a matter of course at what you think are reasonable intervals.
Just my two Penneth
Dave
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