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The check valve stops fuel being pumped back into the float bowl by the accelerator pump. When it is missing, you can see bubbles being blown into the bowl, and nothing gets squirted upwards into the tube where it's supposed to go. The wet gasket was on the other (right-hand) carb. Whether or not the one or both carbs are leaking, I believe the fuel pump may be too. If I change the fuel pump at least I will have eliminated one possible leak. If I still get fuel in the oil I will know it is the carb(s). As it is I still can't see anything in the carbs that would make them leak such a lot. Worst case scenario is I will have a spare fuel pump. That said, I still want to have another look at the carbs to make sure. Regards, Daniel Baum 1969 Type 34 automatic http://www.qldesign.com/type34 > On 5 Jan 2003 at 12:21, Daniel Baum wrote: > > > > I once had a pump (mechanical - carb motor) that leaked fuel into the > > > crankcase. > > > I'm getting more and more convinced that this is my problem. > > > > I can't see anything wrong with the carbs that would cause them to leak. > > There WAS your observation that one of the gaskets was wet on one side while it > wasn't on the other, and that one float bowl wasn't full, AND that a check > valve was missing in one of the accelerator pumps. Is it possible that the > missing check valve (ball & spring) would allow extra fuel to dribble out of > that carb, explaining the wet gasket and the low fuel level. > > I don't know these carbs like many of you do, but depending on how the internal > passages were arranged, that check valve MIGHT be necessary to keep gas from > just flowing (or syphoning) on its own even though the throttle pump wasn't > active. > > -- > ******************************* > Jim Adney, jadney@vwtype3.org > Madison, Wisconsin, USA > ******************************* > > > ------------------------------------------------ > To unsubscribe, E-mail to: <type3-off@vwtype3.org> > For more help, see http://vwtype3.org/list/ ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/