[ainarssems]

There is no reason why fuel would escape baffle housing while car is standing for a while unless it's cracked in which case it would not take week but it would leak out much more quickly. And would only affect if there is less then 1/3 of tank.

I don't think messing with can is the way to do it. When you switch on ignition fuel pump runs for 2-3 sec to prime the system. Just cycle ignition 5-6 times for 3-5 secs each time to get some fuel in system before starting. You would do the same after work done on fuel system like changing filter or fuel pump etc.