pretty neat idea on the fuel tanks
the ammo bunkers already kinda work like that. You take down all ammo bunkers on a field and you can't get any bombs or rockets (no bombers can launch either, only gooney birds).
To keep ammo bunkers and acks down longer, you send someone to take out the ammo factories or the flak factories (each building at strategic factory sites stays down 30min unless city is taken out).