Fuel inlet pipe : an odd pipe union.

[MIG Wielder]

Hi All, I'm fitting a new fuel tank unit and just now I saw this extra pipe union from the filler neck to the petrol tank. Its been nicely brazed in and has a length of copper pipe and then a length of green polythene pipe wich was been doubled back on itself and sealed so it no longer goes anywhere. What was its function please. There is nothing on the inside of the filler neck.
Thanks very much,
Tony.

[GlenM]

It looks almost like a petrol return pipe, for when fuel injection is fitted.

[Carledo]

I'd say it's a breather for use with a non-vented filler cap.

Whatever it is, it's not stock! But wasn't your car a BL development jobbie?

Steve

[MIG Wielder]

Hi Both, Thank you very much for your thoughts. Yes, Steve is quite right in that the car did spend the first few years of its life running around the Gaydon test track with a CVT unit installed. The documentation is a bit vague on the carburation but it may well have had a fuel injection system installed at one point.

Thank you !
Tony.