a fuel distribution shaft rotatably mounted in said bore of said 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 {HEAD ~ passages} of {TAIL ~ said housing} as said shaft rotates, and 
of
a fuel distribution shaft rotatably mounted in said bore of said 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 { HEAD ~ passages } of { TAIL ~ said housing } as said shaft rotates , and
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