Er..ok..now that I think about it .. I've never used a VRO and always figured that there would be an oil reservoir under the hood. Is that not the case? Do VRO motors have a separate external gas tank and oil tank? If so, they must require a special fuel line.
Separate oil and fuel lines from separate external tanks. Mix occurs in the pump. Single fuel line requires premixing. St'd fuel line is used for oil side when used.