Symptoms of a Bad or Failing Accelerator Pump

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An accelerator pump is a component on a carburetor. It is commonly found on many older vehicles that are equipped with carburetors. The accelerator pump is responsible for providing the momentary additional fuel needed under heavy acceleration conditions. When the pedal is suddenly pressed, the throttle will suddenly open, immediately adding additional air for additional power. That additional air requires additional fuel, especially in the precise moments after the throttle is opened, this is the fuel the accelerator pump provides. When the throttle is rapidly opened, the accelerator pump will squirt a small amount of fuel into the throat of the carburetor so that the engine can continue running smoothly under increased load. Usually when the accelerator pump is having issues, it will display a few symptoms that can alert the driver that there may be a problem that should be inspected.

Rough acceleration

One of the most common symptoms that the accelerator pump is having a problem is rough or sluggish acceleration. The accelerator pump is supposed to provide additional fuel needed during acceleration. If there is any problem with the pump, then there will be a problem in the fuel mixture during acceleration. Usually, a faulty accelerator pump will result in a momentary lean condition, which can result in rough or sluggish acceleration, and even misfires.

Engine sputtering or stalling

Another symptom of a faulty accelerator pump is engine sputtering or stalling. The sputtering is caused by the lack of fuel that is supposed to be provided by the accelerator pump when throttle is rapidly pressed. In more serious cases of accelerator pump failure, rapidly pressing on the gas may cause the engine to stall, again due to the lean condition that can be created when the accelerator pump is not working.

A faulty accelerator pump will typically produce a noticeable effect on the engine performance when it fails or is having a problem. If you suspect that your accelerator pump may be having an issue, have the vehicle diagnosed by a professional technician, such as one from YourMechanic. If necessary, they will be able to replace your accelerator pump for you and restore proper performance to your vehicle.


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Recent Car is slow to accelerate Inspection reviews

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YourMechanic Car is slow to accelerate Inspection Service

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Number of Reviews

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Rating Summary
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Brandon

16 years of experience
274 reviews
Brandon
16 years of experience
Ford Taurus - Car is slow to accelerate Inspection - Lawrenceville, Georgia
Very helpful and efficient. He explained every part of his analysis and what was happening and why. Excellent service!
Chevrolet Tahoe - Car is slow to accelerate Inspection - Duluth, Georgia
Brandon was very professional. He test drove my vehicle to experience what I experienced and pinpointe what the problem was. Brandon also quoted me on other services that he noticed that I needed.

Joel

19 years of experience
748 reviews
Joel
19 years of experience
Chevrolet Trailblazer - Car is slow to accelerate - Jacksonville, Florida
As always, Joel did a great job in diagnosing the issue with my car and fully explaining in detail what would be needed in order to correct. He assisted me with setting up a subsequent appointment in order to have it fixed and also provided me with a quote for a 2nd question I had unrelated to what I called him for. Very professional, and prompt.
Kia Rio - Car is slow to accelerate - Jacksonville, Florida
Great experience. Very informative. Not pushy and very professional. Let me know what was going on with my car and what I needed to do about it and how to book an follow up appointment.

Jerimiah

17 years of experience
328 reviews
Jerimiah
17 years of experience
Dodge Dakota - Car is slow to accelerate - Indian Springs, Nevada
Jeremiah was very professional, it didn't take him very long to diagnose the issue of my truck. It was simplified in less than 5 minutes. We'll done, I strongly recommend his services to other customers. 5*! God bless. Bill USN(ret.)
Kia Rondo - Car is slow to accelerate - Las Vegas, Nevada
One word... excellent! Extremely experienced and knowledgeable. I will be recommending Jeremiah to my friends and family.

Matthew

31 years of experience
652 reviews
Matthew
31 years of experience
Jeep Patriot - Car is slow to accelerate - Norfolk, Virginia
Matthew was on time which was a relief, he is very knowledgeable and was easy to understand what was wrong and what was being done. I am recommending to friends and family due to the great experience Matthew gave me. Extremely professional 10/10

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