[Brian in Oregon]

My FJ40 does not have an evaporative system. It's a 1971.

I had to put a hole in the gas cap because of vacuum lock starving the fuel pump, but it looks like the hole is not big enough, or the compression of the fuel cap skirt is closing it. Apparently this cap was non-vented. (I cut the end off my filler tube and welded on a Chevy filler, because of the lack of available locking caps for pre-'72 FJ40's.)