Assertion: carburetor's barrel | /r/CapableOf | use vacuum
Facets:
value: to accuate the secondary
type: PURPOSE
Source sentences:
text: Most original equipment 4 barrel carburetors have “on-demand” secondaries (I use this term rather than vacuum, as some early 4 barrels used vacuum to accuate the secondary, while most 4 barrels from about 1960 up used either spring tension or weights to control the secondary).