I do not have a header and right now I do >not have fuel shut off for each individual wing tank. I have been thinking >all along that I needed the option to shut off each tank to regulate flow >and I do have a plan in place to install a shut off valve for each tank. The >way I have it now, there is a possibility of air intruding the system from a >low level tank. >Mark Jone (N886MJ) ++++++++++++++++++++++++++++++++++++++++++++++++++++++
Mark, I don't think you have to worry about air "intruding" the system from the low level tank. Any flight mode that "unports" the fuel pickup in one tank will also have fuel filling the crossover line and running from the high tank to the low tank. The only flight mode I can think of that will "unport" both fuel pickups at the same time is inverted flight and negative G's. I doubt that you will have extended durations of either. I have basiclly the same set up. Wing tanks only, no header, and dual fuel pumps. The only difference is I have a shutoff for each tank. With 10 hours flight time and all my taxi time my setup has not caused the engine to miss a beat. My wing tanks are long and narrow and in the outer wing panel with a 5 inch rise at the tip so even with only a gallon or two of fuel and the KR in a nose up or nose down attitude, I should have fuel at the pickup point. The only problem I can see with your system is, depending how full your tanks are, if the airplane is setting on a ramp with one wing low it could overfill the low wing tank and run fuel overboard through the vent. Larry Flesner
