hey guys,
i have twin 45s on my 4age bigport.

i run a Facet pump with one line straight to my carbs, and it seems when i have the car turned off it will slowly start to leak out one of the trumpets, im thinking perhaps the tank is becoming pressurized over the day, i seem to be leaking a fair bit of petrol, and its expensive so i'd like to know how.. leaks about 1 drop ever 5-10 seconds

IF it was becoming pressurized, whats the best solution? i was thinking to just drill a 1mm hole thru the top of my fuel cap, as i figure evap thru the cap would be nothing comparerd to the amount im loosing out my trumpets.