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FUEL DELIVERY SYSTEM
The vehicle’s fuel flows by gravity feed into the petcock valve, where its flow rate is boosted
through vacuum assistance, allowing for a steady and potentially constant feed into the
carburetor. From the petcock to the carburetor, the fuel undergoes a double-filtration process.
First, the fuel flows through a strainer as it enters the petcock, removing any major debris. As
it exits, the fuel travels from the petcock nearly directly into an in-line filter, removing any
residual debris and/or sediment before entering the carburetor.
The vehicle’s air supply endures a much shorter process. It initially enters through the air
filter, located on the left-hand side of the engine. From here, it flows through a duct, finally
mixing with the fuel and undergoing CARBURETION.
Fuel that enters the carburetor first flows into the float chamber. As the fuel level rises, so
does a float. When atmospheric equilibrium is reached, the float makes contact with the
needle valve, causing it to close and thereby stop fuel entry until the float level drops again.
ENRICHMENT. When the engine is
started, an electronic ENRICHMENT valve
opens, allowing a portion of fuel to spray
directly into the carburetor throat. This
makes the air/fuel mix richer, increasing
volatility. This makes it easier for the
vehicle to start. Once the engine is running,
the enrichment valve gradually closes, and
the IDLE circuit takes over. This allows the
air/fuel mixture to become leaner, which
results in optimum combustion efficiency.