Patent ID: 8726884

Claim:
A quill assembly for a dual fuel common rail fuel system having a first fuel rail and a second fuel rail, the quill assembly comprising: a first quill tube having a first quill tube inlet end and a first quill tube outlet end and defining a first quill tube inner wall; a second quill tube nested within the first quill tube, the second quill tube having a second quill tube inlet end and a second quill tube outlet end and defining a second quill tube inner wall and a second quill tube outer wall; an outer conduit formed between the first quill tube inner wall and the second quill tube outer wall, the outer conduit fluidly communicating with the first fuel rail; an inner conduit defined by the second quill tube inner wall and fluidly communicating with the second fuel rail; a first compression assembly including: a first piston operably coupled to the first quill tube inlet end and fluidly communicating with the first fuel rail to apply a first piston axial force against the first quill tube inlet end; and a first spring operably coupled to the first piston and configured to apply a first spring axial force against the first quill tube inlet end; and a second compression assembly including: a second piston operably coupled to the second quill tube inlet end and fluidly communicating with the second fuel rail to apply a second piston axial force against the second quill tube inlet end; and a second spring operably coupled to the second piston and configured to apply a second spring axial force against the second quill tube inlet end.