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KurtN=> Any suggestions? Jim's pretty well covered the likely sources of exhaust, but I'm wondering whether you're actually smelling of raw fuel. If so, there are some other possibilities. In a carb conversion, it's possible to overlook ports on the tank that the carbs don't need, or set them up inappropriately as tank pressure relief. There's also the invariably rotten rubber elbow at the filler port on later cars. In the rear, you could also simply have some seepage around a fuel line connection, from any port on the carb, or from a loose throttle valve. If your engine cover is not tightly sealed, any of these could put fumes inside. Incidentally, compared to a door seal, an engine cover seal costs almost nothing. It's very important to the interior air quality, and should be renewed as often as your fuel lines at least. Steven Ayres, Prescott AZ '66 KG1600 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org