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From: Bill Hannahan <wfhannahan@yahoo.com>
Subject: fuel tank drains
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  [You might comment on installing additional inline automotive (non-bypass) very fine filters upstream of gascolator. 
  
 
  Charlie K.]
   
  I’m not sure what comment to make Charlie. Most cars are fuel injected with a high pressure fuel pump in the tank. They can overcome a substantial filter pressure drop.
   
  Most small aircraft suck fuel out of the tank relying on the small pressure difference between the vapor pressure of the fuel and the tank static pressure. My concern is that a small amount of water may fill the fine mesh pores and create enough pressure drop to stop fuel flow. 
   
  I wonder if that might be a factor in Gene Long’s mystery fuel flow interruption.
   
  Aircraft carburetors and fuel injection systems have fine screens in their inlets, but they are downstream of the aircraft fuel pump, so a much greater head pressure is available.
   
  I think it is best to minimize resistance to flow upstream of the fuel pump, what do you think?


Regards,
  Bill Hannahan
  
wfhannahan@yahoo.com

       
---------------------------------
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<DIV></DIV>  <DIV class=MsoNormal><?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p>&nbsp;</o:p></DIV>  <DIV class=MsoNormal><o:p>&nbsp;</o:p></DIV>  <DIV class=MsoNormal style="LINE-HEIGHT: 14.4pt"><SPAN style="COLOR: #333333">[You might comment on installing additional inline automotive (non-bypass)&nbsp;very fine filters upstream of gascolator. <o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal style="LINE-HEIGHT: 14.4pt"><SPAN style="COLOR: #333333"><BR>&nbsp;<o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">Charlie K.]<o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333"><o:p>&nbsp;</o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">I’m not sure what comment to make Charlie. Most cars are fuel injected with a high pressure fuel pump in the tank. They can overcome a substantial filter pressure drop.<o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR:
 #333333"><o:p>&nbsp;</o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">Most small aircraft suck fuel out of the tank relying on the small pressure difference between the vapor pressure of the fuel and the tank static pressure. My concern is that a small amount of water may fill the fine mesh pores and create enough pressure drop to stop fuel flow. </SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333"></SPAN>&nbsp;</DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">I wonder if that might be a factor in Gene Long’s mystery fuel flow interruption.<o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333"><o:p>&nbsp;</o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">Aircraft carburetors and fuel injection systems have fine screens in their inlets, but they are downstream of the aircraft fuel pump, so a much greater head pressure is available.<o:p></o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN
 style="COLOR: #333333"><o:p>&nbsp;</o:p></SPAN></DIV>  <DIV class=MsoNormal><SPAN style="COLOR: #333333">I think it is best to minimize resistance to flow upstream of the fuel pump, what do you think?<o:p></o:p></SPAN></DIV><BR><BR><DIV>Regards,</DIV>  <DIV>Bill Hannahan</DIV>  <DIV><BR><A href="mailto:wfhannahan@yahoo.com">wfhannahan@yahoo.com</A></DIV><p>&#32;
      <hr size=1>Luggage? GPS? Comic books? <br>
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