There is probably a need to "probe" the internals of the tank ports to see if they are longer, going past the tank walls, screened internally, etc. Any over flow could come in low but then rise toward thew top of the tank, for example. A drain line going to the back of the engine would return oil to the sump. Is this devise an oil separator? Oil to sump, air to atmosphere?
Ken Geiger, Toronto
1965 GTA, RHD, Corsa, Trans/Am 66-72
1964 Sprint GT, B-Sedan in 70's
1970 Giulia Super (CDN Spec)
1976 1600 GTj (Italian Spec)
1966 Harley Sprint (Aermacchi) 250
2000 Catalina 320, Hull #765 Northern Dream