The result is that when both inner and outer are selected together (ie. takeoff on both), fuel gets pushed out of the inner, through the fuel tap into the outers and eventually out under the fuel caps >Any other ideas or similiar experiences to discuss would be most welcome. >John and Janet Martindale +++++++++++++++++++++++++++++++++++++++++++++++++++++++++=
John, Do you NEED to be drawing from all four tanks for takeoff and landing? If it's because of the way your fuel system is plumbed, i.e. pumps, tanks, shutoff valves, I would just consider changing the plumbing. If you have wing tanks only (like me), I understand the need to run two pumps on takeoff and landing but I'm not sure why you need to be drawing from four tanks. I have a 12.5 gal tank in each outer wing panel. My lines run from each tank to a shutoff valve in the cockpit (mounted side-by-side). Just past the shutoff valve is a "T" that brings the two lines into one. Next in line are two fuel pumps in parallel and then on to the carb. With this setup I can use either or both pumps to draw from either or both tanks. I will land and takeoff with both pumps drawing from both tanks and cruise with one pump drawing from both tanks unless I want to draw from one tank only for balance. An aircraft with a header tank only is drawing from just ONE tank for ALL flight modes. I'd consider other options before you open up the wing to re-do the vents. For those Your results may vary. :-) Larry Flesner
