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I drilled a small hole in the cap to allow air to enter the tank so there would not be a vacuum created as the fuel is drawn out of the tank and I used the smallest drill bit that I had.  On my car the top of the tank has a cap to return fuel vapor from the air cleaner to the charcoal can and back to the tank,  This line is already plumbed so it made a perfect fuel return line for me.  I did not have to modify the tank in any way to get this done and it seemed a logical choice for me.  I now have 1500 miles on this system with no issues so it seems to be working.  MY EFI system is for cars up to 500hp.