Hello. And thanks for the donation. Much appreciated. Hope this helps. Let me know
All models use engine-mounted mechanical fuel pump with internal check valves. Fuel pump push rod is driven by camshaft lobe.
All models use a 2-barrel Stromberg style downdraft carburetor with mixture control (duty) solenoid, automatic choke and piston-type accelerator pump. Carburetor integrates low speed (primary) and high speed (secondary) barrels, while using a common fuel bowl. Idle speed is set with idle speed screw. An evaporative fuel system keeps fumes from venting to the atmosphere.
The automatic choke uses an electrically heated, bimetallic element to control choke valve opening. Choke element is powered through choke relay.
Fuel-Cut (Slow-Cut) Solenoid
Solenoid decreases fuel delivery during deceleration. It also prevents engine overheating and after-burning in exhaust system. ECM uses idle (vacuum) switch and MAP sensor signals to control fuel-cut (slow-cut) solenoid. See IDLE (VACUUM) SWITCH and MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR under INPUT DEVICES.
Idle (Vacuum) Switch
The idle (vacuum) switch provides ECM input signal. ECM reads idle (vacuum) switch and MAP sensor signals to determine idle, part throttle and WOT conditions. ECM uses these sensors to control fuel-cut (slow-cut) solenoid.
Manifold Absolute Pressure (MAP) Sensor
The MAP sensor reads intake manifold pressure changes with reference to zero or absolute vacuum.
Thursday, January 8th, 2009 AT 8:04 AM