Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Carburetor - Carter BBD 2-Bbl: Description
The Carter BBD carburetor is a 2-barrel downdraft model. The BBD has four basic fuel metering systems. The float (fuel inlet) system, idle (low speed) system, accelerator pump system and the main metering (high speed) system.
The float system maintains fuel level. The idle system is used for idle and initial part-throttle operation. The main metering system is used for part-throttle and cruise operation. The pump system provides additional fuel during acceleration.
An electric choke with a choke diaphragm is used. A stepper motor is used to control air flow in metered air bleeds in the main fuel metering circuit. A Solevac vacuum solenoid is used to keep idle speed constant when load is placed on engine.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.