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Along with its needle-seat assembly, the float is a critical element to maintaining the fuel level in the carburetor float-bowl. The brown unit (top) is an original Pontiac float, while the black unit (center) is a modern replacement. Ruggles says the original is very susceptible to ethanol-related failure, while the replacement is not. The brass float at bottom is another modern alternative. However, Ruggles suggests that it be submerged in water and closely checked for minute air bubbles that could indicate an internal leak.