>As a poor-man's alternative, I now have the 912 return-line
restrictor
>located just behind the firewall (because there is a joint in the
return
>line there and because it creates more unrestricted vapour headspace
in the
>top of the return line); so, if the return line is severed at a
point
>forward of the firewall, the restrictor provides at least some
restriction
>to backflow from the tank; LAA know about this and approved the
>installation.
As the flow back to the tank is slow one idea might be to place a
second inline restrictor by the tank (slightly larger orifice if
considered necessary). Any fracture in the line between the firewall
and the tank would result in a very limited flow rate of fuel.
Nigel Charles
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