Re: vented vs. non-vented....
That tank car didn't just implode from being drained. It was evacuated by means of high volume vacuum pump lowering the internal pressure, probably something in the neighborhood of 20 plus inches, enough that only 14.7 psi, atmospheric pressure, collapsed it. Nothing like this could happen to a bicycle fuel tank because there is nothing 'sucking' the fuel out. It would take a good fuel pump, and a poorly made fuel tank to collapse a tank like the rail car. Tank cars are designed to withstand positive internal pressure, not a negative pressure. Rapid temperature changes can cause collapse of some vessles if conditions are right, such as reduced internal pressure and rapid application of heat/cold to the outer surface.
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