a fuel distribution shaft rotatably mounted in {HEAD ~ said bore} of said {TAIL ~ housing} including axially spaced, mutually communicating fuel receiving and fuel discharge ports in a side of said shaft that are simultaneously registrable with said fuel receiving and fuel distributing passages of said housing as said shaft rotates, and 
a fuel distribution shaft rotatably mounted in { HEAD ~ said bore } of said { TAIL ~ housing } including axially spaced , mutually communicating fuel receiving and fuel discharge ports in a side of said shaft that are simultaneously registrable with said fuel receiving and fuel distributing passages of said housing as said shaft rotates , and
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