Bill Freeman wrote:

Second, the only fuel injected system shown  (C185) has a header
 tank and the header tank is vented back to the fuel tanks.  I think
 this is very important, and any fuel system with a header should
have that header vented, either directly to the air, or if there is a
possiblity or certainty of fuel coming up the vent, then we should
vent the header to the main fuel tanks and use the fuel tanks as a
fuel separator, and the fuel tank vent will vent the header.  Note
also that Cessna runs the fuel pump return fuel back to the header
 tank which has been speculated may cause fuel heating during
prolonged ground operations (low power, low fuel flow to engine,
high bypass flow, low airflow), but since the header is vented
back to the mains, any vapor generated is dealt with.  Also note
the check valve in the fuel return line to the header tank (Cessna
calls it a fuel accumulator tank).

 
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