Is it possible the tank has a crack? No fuel leak but vapor can escape? Usually in the top of the tank.
Coming from FZJ80, clogged charcoal canister can cause pressure in the tank and tank can crack on the top. 80 owners have had that issue.
Coming from FZJ80, clogged charcoal canister can cause pressure in the tank and tank can crack on the top. 80 owners have had that issue.