Briggs Vacuity

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We moved into a house with a Briggs vacuity model 4400 and there is a leak from the tank to the supply line. I can't find any installation instructions and don't know if I have the washers in the correct place. Does anyone know where to find installation instructions for all the pieces inside the tank? My specifc question is whether the washer on the ballcock (grey piece with tube for water supply) is suppose to have the black washer on the inside of the plastic tank or is it supposed to be between the toilet and the ceramic tank.

Seems like the water is leaking from the ceramic tank so maybe not getting into the plastic tank? I tried Briggs website but they only have instruction for mounting the bottom part of the toilet to the floor.