I set out to replace the rubber seal and plastic nut at the top of the fuel tank. Things went smoothly until I tried to attach the new plastic nut. I cannot get it started. After mashing on it with all my weight and trying to turn it I inadvertently broke the spigot on the top of the fuel sending unit. Cool. Cool. The old nut drops right on and easily spins half turn ... hmmm. I got out my calipers to measure the parts and the new one is about 2mm smaller OD and ID. It is a genuine part in a sealed Porsche bag. (??) Did I get a bad one or are these just a PITA to fit when new?
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