thanks for the explanation. I was trying to explain this to someone yesterday, but lacked the details of how it worked.
Chris --- David Brodbeck <[EMAIL PROTECTED]> wrote: > Christopher McCann wrote: > >I figured that gas tanks are > >vented too...I didn't realize they are vented in a > >different way, but obviously they must be or 1/2 > your > >gas would disappear on a hot dry day. > > > > They used to just be vented to the atmosphere. My > '75 VW Bus, for > example, had an open vent line behind one of the air > intakes. It went > directly to the gas tank after going through an > anti-siphon loop. > (Lawnmowers and the like are still vented this way, > usually through a > small hole in the gas cap.) > > When the EPA started to regulate auto emissions, > they realized that a > major contributor to photochemical smog was all the > unburned gas fumes > evaporating out of car fuel tanks. They started > mandating some kind of > vapor recovery system. On most cars, the fumes are > collected in a > canister of activated charcoal while the car is > parked. The next time > the engine is started, they're drawn into the intake > and burned. This > depends on the gas cap having a good seal, of > course. > > > _______________________________________ > For new parts see official list sponsor: > http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://striplin.net/mailman/listinfo/mercedes_striplin.net > Christopher McCann, Squier Park, Kansas City, Missouri -1987 300TD, 150K miles, "Rotkäppchen" (Little Red Riding Hood) -1985 300SD, 209K miles, "Wulf" (http://www.pictureblogger.com/My-1985-Mercedes-Benz-300SD) -1976 240D, ManyK miles, "AKP-Wagen" (Alternativen Kraftstoffs Prüfenlastwagen = Alternative Fuel Test Vehicle) running WVO/WMO/LO/CO/WATF/WGL/WBF/DA/MS/lard/gas/kero/D2 mix (do not attempt this at home!) -1972 Jacobsen 21" Turbo Vent -1971 Case 222 Hydrive, 12HP Kohler, 38" deck, Snowcaster, "One Banger" __________________________________ Yahoo! Mail - PC Magazine Editors' Choice 2005 http://mail.yahoo.com
