Brandon,

What was your method for dealing with the slightly collapsed tank? Did you apply a low air pressure - and how? I would presume you could do this with something like a bicycle tire pump and that would give you a nice slow control over the expansion.

I don't have any reason to believe I have any tank implosion but one of my vehicles seems to have some air flow when I remove the filler cap. Not a big whoosh but enough that the vent is likely to be partially blocked.

Is the typical vent failure a plugged opening under the car or a collapsed fuel line closer to the top of the tank?

Ken300D

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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles