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Gas tank ventilation

Fuel System

Vehicle Information: Model: 911 Carrera; Year: 1987; Body Type: Coupe; Engine (type, size, modifications): stock, 3.2 ; Total Mileage: 87,000;

When pumping gas into the tank, the gas nozzle automatically shuts off the flow, unless I pump the gas slowly and pull the nozzle nearly out of the filler opening. I suspected a crimp somewhere in the gas tank vent system.I have traced the vent lines (PET, page 92, illustration 201-15) and have checked each line separately from the hose (#9)to the junction of hose #14, using a large syringe and an air line on low pressure. There is airflow, altho the rate is somewhat slow due to the reduction in diameter of the hoses. However, I cannot locate the end of the venting line and the two sleeves, clip and protection cap (items 20, 16 & 17 in the illustration) to confirm air is flowing through them and into the atmosphere. Looking at the lines, this line goes beside the gas tank, inside the trunk and then disappears. I have removed the protection plate that covers the fuel pump, and still cannot find it. Where is it, and what other suggestions do you have to address the vent problem? Thanks!

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