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Factory Five Roadster Fuel System Install Filler Pipe

To begin prepping the tank for installation, the filler pipe seal was installed first. The seal is a tight fit (understandably so) to the tank as well as the filler neck itself. A light coating of assembly grease or other spray lubricant helps. Just be sure to not push the seal too hard and have it fall into the tank.
Factory Five Roadster Build Part 8 - EFI Fuel System

To begin prepping the tank for installation, the filler pipe seal was installed first. The seal is a tight fit (understandably so) to the tank as well as the filler neck itself. A light coating of assembly grease or other spray lubricant helps. Just be sure to not push the seal too hard and have it fall into the tank.  View Related Article