I am just guessing, but I think that the closer to the windshield you get, the lower the pressure. I always put my cap near the front of the forward deck and vent the tank through the firewall to a tube extending below the fuselage, bent forward to get a slight positive pressure.
See N64KR at http://KR-Builder.org - Then click on the pics Daniel R. Heath - Columbia, SC da...@kr-builder.org See you in Mt. Vernon - 2004 - KR Gathering See our EAA Chapter 242 at http://EAA242.org
