Frank,
My D.VII has the same fuel tank as your plane. I installed a sump valve, disposable filter....and no gascolator. The sump can be easily drained every preflight, sump fuel drains down the clear hose and through the bottom of the plane.
This is just a fit-up, finished installation with have clamps on the hoses. There is stainless braided hose with AN fittings firewall forward.