Leaking fuel sending unit

Hi everyone. Can someone tell me what I'm doing wrong? I bought a new fuel tank, sending unit (Van's) and lines (Inline Tube) for our '66 300. Before I strapped up the tank, I installed the sending unit, centering it into the notch on the tank, put the gasket over the unit and tightened the lock ring with the proper tool. Excited, I started filling the tank. At about 16 gallons, fuel started pouring out of the bottom of the sending unit. After siphoning gas back out, I loosened the ring...

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Author: Ffranzwa