dry header tank

[R.J. Chevalier]

Rather than take anyone else's word for it, why not find out for yourself how much usable you have.  Note first that while the wings are full, you end up with about a half inch of fuel more than when you shut down and the slight head of fuel runs back into the wings.  I would mark the usual high point on the fuel indicater as well as the low point at rest.  Then drain the fuel out of the header tank by opening the gascolator drain and let the fuel run into a 5 gal. gas container.  I'd keep a second one handy, you may end up with more than 5 gal's.  When the stream turns into a trickle, thats all your usable fuel from the front tank.  The reason for marking the fuel level is so you know when the wings are dry and you start using up the front tank usable fuel.  Another thing you might note while draining is when the float hits bottom I.E. stops jiggling.  From this point you should know how much fuel remains after the float hits bottom.  In my Forney it was about 1 gal or about 15 min. to engine shut down.  Just about enough time to find a good emergency landing spot.   Dick in Columbus NM