The toyota prius uses a bladder in the tank and has no vent.  I imagine a
few others may do the same.

----- Original Message ----- From: "William" <wschertz@ispwest.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Monday, February 21, 2005 10:18 PM
Subject: [FlyRotary] Re: Vapor Lock


MessageI believe cars vent through a charcoal absorber. May allow slight
pressurization, but not much.
Bill Schertz
KIS Cruiser # 4045
 ----- Original Message -----  From: Russell Duffy
 To: Rotary motors in aircraft
 Sent: Monday, February 21, 2005 6:04 PM
 Subject: [FlyRotary] Re: Vapor Lock


 There is a third option.
 Seal the vent when not flying.

 I would not recommend this for RV wing tanks.
 Makes me wonder about cars.  Aren't those tanks sealed, or at least sealed
to some pressure?