What to know about the Accelerator Pump:
You may not be conversant with the term “accelerator pump”. They’re not part of modern vehicles, but they were widely used on older cars. An accelerator pump is part of a car’s carburetor system and is in charge of spraying fuel into the carb. Basically, it did part of the job of today’s fuel injectors. While accelerator pumps might not be part of modern vehicles, there are plenty of carbureted cars still on the road, from classics to hand-me-downs, and they all require an operational pump.
SEE ALSO:HOW TO REPAIR CAR VACUUM PUMP
In a carbureted car, the accelerator pump is in charge of increasing and decreasing the amount of fuel supplied to the carburetor. It works in tandem with the vehicle’s vacuum distributor, which provides a timing advance to handle acceleration. The accelerator pump ramp up fuel delivery as the throttle is depressed, giving smooth acceleration.
Over time and through use, the accelerator pump will wear, eventually requiring replacement which is usually done alongside a carburetor rebuild. Premature failure is also possible, although not extremely common.
Facts to Note:
The accelerator pump is part of the fuel delivery system and should never be examined or changed except by a trained mechanic.
The accelerator pump is not checked during normal maintenance.
How to Fix:
The accelerator pump is confirmed to see if it needs to be replaced
The defective accelerator pump is removed
The new accelerator pump is installed
The accelerator pump is tested for operation
The vehicle is tested to ensure proper operation of the accelerator pump
Without a working accelerator pump, your vehicle will not respond with smooth acceleration when pressing the gas pedal hard. Slow acceleration will not be affected; this part is only required for fast acceleration. If you suspect your accelerator pump is not working correctly, have one of our expert mechanics diagnose the condition.
Common symptoms indicating you may need to change the Accelerator Pump:
Engine does not accelerate smoothly under moderate to hard driving conditions
Engine stutters or stalls during hard acceleration
Smoke from exhaust (rich operation)
Importance of this service:
READ ALSO:HOW TO REPLACE A WINDSHIELD WASHER PUMP
The accelerator pump is vital in order to deliver smooth acceleration in a carbureted system. If the pump is not working properly, it could result in either lean or rich operation, both of which will damage the internal parts of your engine. Also, poor fuel delivery results in substandard acceleration which may cause you to be a dangerous obstacle in traffic. Have a defective accelerator pump changed as soon as you can.