I've flown a bunch of machines with them and have had to use the tips a fair amount. cdnpilot77 is spot on. Burn the front tank down to around 4 or 5 gals on the gauge and then switch to the center or rear tank and open the valve for the tips and let it fill the front to 24 or so. Then burn off a chunk from the front again and then let the remainder fill in as you burn off more of the rear/center. Be sure to close the valve when on the first transfer or it WILL just puke it out the vent line on the front tank after its full. On the second transfer (for whatever was left remaining) I just leave it open though. I was also advised (and know that this is true on the twotter as well) that you shouldnt really be landing with fuel in the tips. IIRC there was no addendum to the C of G calcs for fuel in the tips, but I may be wrong on that. Also be sure to check that theres zip in those tanks via the quick drains before filling them. If they havent been used for a while condensation and or rain water may have found its way in there. I'd check them empty, fill them, let sit for 20 mins (maybe while you fill the belly tanks) and re-check. But I'm a bit of a granny when it comes to fuel.
edited to add - It was around 3-4 mins for the machines I was flying to transfer. It is after all a gravity feed with a slight aid from the little ram air scoops, which you may want to check for debris  |
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