The level in the header tank is determined by two things. The first is the height of the over flow standpipe. Depending on tank construction, this may be a tube coming in from the bottom that can slip down, or an elbow in the aft side that can be twisted down by contact with a fuel nozzle. Either way the tank will maintain a level lower than originally designed.
The second factor is the fuel coming in less the fuel going to the engine. In a properly operating system the fuel coming in should always exceed that used by the engine, so the level is determined solely by the standpipe. If your level is constant but lower than expected I'd suspect a problem with either the standpipe or the cap. If it is low in flight but comes up when fuel consumption is reduced, like descent, then I'd suspect a problem with the pump or lines. Adding an electric pump does not address the problem, whatever it may be. John Cooper Skyport Services 4996 Delaware Tnpk Rensselaerville, NY 12147 518 797-3064 www.skyportservices.net
