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On 18 Dec 2005 at 20:39, Russ Wolfe wrote: > Working for a fuel system components manufacturer, we have to leak test > the parts we make. We cannot safely test these parts with gasoline. We > test them with air. Through scientific means, it has been established > that a 3cc per minute air leak will NOT leak gasoline. This is at 70 psi > air pressure. So a system that does not leak gasoline CAN leak air. This > works both ways, out of the system or into the system. Also, when the > engine is hot, it will boil the fuel in the lines turning it to vapor > and pushing it back into the tank. I'm surprised you can get away with an air leak rate that high (are you sure it's not 0.3 cc/min?) but either one would certainly explain our observations. I agree completely that a system that does not leak gasoline can leak air. I would expect injectors, even new ones, to have higher leak rates than components which were supposed to be completely sealed. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~