On Doug32's random O-Ring front, hopefully case solved :-).
There is one that size used on the spacer for the fuel pump inside the assembly. Look for P/No 9030108019 on this part cat illustration FUEL TANK & TUBE | Toyota LAND CRUISER PRADO KDJ150R-GKAEYQ 08.2009 - 06.2015 | Parts Catalogs | PartSouq
It could have been lost/dropped during replacement of the pump at some stage or during original assembly and lodged somewhere inside swirl pot so not found.
There is one that size used on the spacer for the fuel pump inside the assembly. Look for P/No 9030108019 on this part cat illustration FUEL TANK & TUBE | Toyota LAND CRUISER PRADO KDJ150R-GKAEYQ 08.2009 - 06.2015 | Parts Catalogs | PartSouq
It could have been lost/dropped during replacement of the pump at some stage or during original assembly and lodged somewhere inside swirl pot so not found.
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