The mounting of the seat tank and placement of the fittings should be engineered to best fit your application. Below are some ideas successfully used by others in the past.
Cut-away tank showing fuel sump. Suggested mounting positions for valve and elbow fitting in tank bottom and quick drain in sump bottom. Quick drain is almost flush with bottom of sump allowing for nearly total sediment & water drainage. Tank fitting positions should be altered to suit your particular requirements.
To install quick drain:
To install fuel level sight glass: (NOTE: Electronic fuel gauges are available for seat tanks.)