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Periodic fuel leak

Fuel System

Model: 911, Year:1989, Mileage:101,00, Type of use:Both Street & Track
89 3.2 Carrera with 101K miles that will leak a small puddle of gas after sitting for many weeks. If I start the motor regularly, no leaking. The leak is behind the throttle body. It looks like it might actually be one from a small vacuum hose. When it does leak, it shots the fuel in a stream like a pin prick in a water balloon. Unfortunately due to the location, it is very difficult to see for sure the source or exact leak location. Any thoughts of the line or source of my phantom leak? Otherwise the car runs great.

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