Toyota 79 series fuel tank breather

I can’t remember any Landcruisers that didn’t gurgle when removing the fuel cap, at some stage of their lives. Have also read lately of blokes fuel tanks being sucked in, due to blocked breathers, though I feel this may only have occurred with the later 130L tanks, on both single & dual cab models?

During the ‘70’s, some more senior gentlemen than I, and more experienced too, were often concerned about another valve/breather that is hidden away above the main tank. This little gizmo vented into the chassis, and was often blocked by mud in the chassis or broke away and filled with, mud, dust or wasp nests. Don’t recall if any tanks imploded but do recall these senior gents were more concerned about poor performance from the early asthmatic, Toyota diesel engines.
Have added a couple of images of this hidden valve for those unaware of it’s presence.





Bob