B11 Sunny MPG versions used an Hitachi DFP306 carburetor. It is a feedback carburetor which uses an O2 sensor and air/fuel solenoid so it can dynamically adjust the air-fuel mixture. The 306 is a smaller version of the DFP342 used on the Z24-powered Datsun 720 pickup.
Overview
FOR COMPARISON: DFP-342/DFP-384 parts diagram
1982-1983 Nissan Sentra "MPG" Mazda GLC 1.5 * Fuel-cut solenoid (same spot as B110 DCH306) * Fuel Bowl Solenoid * Air fuel solenoid * vacuum secondary like the B310 DCR306
DCP
DCP306-23 1984-1987 Subaru