<VV> Gas tanks and caps

[Sethracer at aol.com]

Almost, Clark - Right - "All gas tanks are vented"  Wrong -  "Check valve 
in cap" - Some have it in the cap, some vent the tank in another  path, often 
through charcoal cannisters or other  convoluted path. Sometimes 
manufacturers change from one type of  venting to another. Chevy did so on the Camaro. 
So some cars will not have  a vented cap, all will have a vented tank.  - 
Seth
 
 
In a message dated 12/28/2013 10:38:41 A.M. Pacific Standard Time,  
chartzel at comcast.net writes:

Several  comments have been made that new cars don't have vented gas  tanks.
WRONG!  All gas tanks are vented thru the cap or you wouldn't  be able to
suck or pump fuel to the engine.  The only difference is  newer cars have a
check valve in the cap to allow air in but not gas vapors  out.  So all the
time you are driving there is air (and moisture)  going in the tank.
Clark  Hartzel

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