The killing problem is almost surely related to a faulty fuel pump. Your one way ventilating system is malfunctioning. When you pull your cap off it's not releasing pressure, it's sucking air in. This is probably compounding the fuel pump problem. As the fuel pump is sucking fuel out, no ventilation is coming in to fill the space so the pump has to work harder and harder as it creates a vacuum in the tank that it's sucking against.
For an example, grab the nearest bottle of beer, or mountain dew, whatever. Now take a good swig from the bottle with your mouth sealing the end. Get a little hard to keep sucking liquid out? Same thing the pump has to deal with, albeit I'm sure on a much lesser scale. That is causing an already weak pump to overheat and die IMHO.
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