Out of interest do you actually need on of these valves? I can't recall seeing in the iva manual anything about one way valves.
I know the tank needs to be vented. If you took a hose from the top of the tank to below the bottom of the tank, if the car was upside down the bottom of the hose becomes the highest point and the tank won't empty anyway.
I know it doesn't work if the car ends up on it's side, but if you manage to end up upside down, or on your side you'll be in a pretty bad state / dead I would imagine.
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