I have to assume the design was not to have fuel lost after filling up. The fuel is probably NOT drawn from both tanks equally. Assuming equal pressurization of the wing tanks by the vented caps, as soon as the overflow receiver tank (in my case the left) gets significantly more fuel in it, that tank will present more pressure to the tee and as the pump draws off fuel, the majority, if not all, should be from the higher pressure source. Following that logic, any excess in the left tank should flow to the right, which after sitting still after flight, it will do. From my experiment (filling only the right tank) I must assume that the flow rate crossing from left to right is less than the demand rate from the fuel pump or the tanks would continuously equalize, which they don't seem to do. It's all very mysterious!
Reminds me of the thermos bottle - if you put something cold in it, it stays cold - if you put something hot in it, it stays hot. The mystery is, how does it know? -----Original Message----- From: Bob U. <[EMAIL PROTECTED]> To: [EMAIL PROTECTED] <[EMAIL PROTECTED]> Date: Monday, May 22, 2000 10:08 AM Subject: Re: [COUPERS-TECH] Fuel Route >My return is to the RIGHT tank, not left. >Both FLAVORS do exist depending on serial number. >However, I am confused by your BOTTOM LINE, not your LOGIC. > >My ***TANK with the RETURN LINE, OVERFLOWS***, if it is full to start with. >This happens easily, if all tanks are full to begin with. > >[EMAIL PROTECTED] wrote: >> >> It seems (and I could be mistaken) that the fuel from both wing tanks tee >> together, feed the fuel pump which feeds the fuel to the header tank and the >> excess goes to the left tank. > >Not mistaken. > >>I have tested this theory by putting some gas >> in the right tank only (my home tank is nearer the right tank as I pull the >> plane out of the hangar) and immediately go fly. The header builds up its >> "head" of fuel while flying, > >Should never be less than full, unless BOTH wing tanks were empty beforehand >or the header is leaking fuel... ususally due to carb needle/seat >characteristics. > >>and then the right tank is mostly empty and the >> bulk of the new fuel is in the left tank. Now here is the question: > >You are OK to this point, in my opinion. > >> >> Why doesn't the right tank overflow through the vented cap assuming all >> three tanks are nearly full\??? > >THe fuel is drawn from BOTH nearly equally, right? >SO the the tank with the return is getting fuller while the right tank is >getting nothing back. > >> >> Dick in NM >> __________________________________________________________________________ ______ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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