This is what I'm talking about. Is it a rear diff breather?
https://forum.ih8mud.com/diesel-tech-24-volts-systems/424622-what-part-what-does-do-hdj81.html
Kelvin
Sorry I had the wrong URL in there. Had to change it.
The other URL has an exploded view of the tank - in Russian but the vent is there too.
Схема: Топливный бак и топливопровод на Toyota Ленд Крузер HZJ81V - -INF
I don't know 80 series tech but we havent got that on the diesel 60's.