Originally Posted by staleg
I have also considered the valve that techinspector links to, but isn't this is a valve inteded to avoid fuel spill during hard accelration and such. Not a tip over valve?
And besides that, the Eckler solution vill be more expensive for me, than if I sacrifice the Jaguar fill neck.
Here's the link, decide for yourself......
Chevy Gas Filler Neck Valve, One-way, 1956-1957
I guess you have no interest in producing them locally for sale.