Skip the auto shop - Our mechanics make house calls

How Long Does an Accelerator Pump Last?

accelerator pump

If you drive a newer vehicle, you may not be familiar with accelerator pumps. New vehicles almost invariably operate on a system of fuel injection, and the accelerator pump is a component of carbureted cars. In a carbureted vehicle, the accelerator pump works to regulate the flow of fuel that is supplied to the carburetor, increasing and decreasing it as needed. As you press down on the gas pedal, the accelerator pump works to deliver more fuel, resulting in smooth acceleration. It works along with the vacuum distributor, which is a timing device.

If you drive a carbureted vehicle, you use your accelerator pump many times, every time that you drive. Eventually, if you drive long enough and frequently enough, the accelerator pump will begin to show signs of wear. Usually, it is replaced in conjunction with rebuilding the carburetor. Very rarely, the pump may fail prematurely. Given the variables involved, it is not possible to say with certainty how long your accelerator pump will last, but it could very well last you the life of your car.

Signs that your accelerator pump may need to be replaced include:

  • Car does not accelerate smoothly when gas pedal is pressed hard (note: a bad accelerator pump does not affect slow acceleration, only fast acceleration)
  • Engine stalls or stutters during hard acceleration
  • Exhaust smoke

Poor acceleration can be dangerous if you need to pass, merge, or perform other operations where you need to be assured that your car can accelerate quickly. If you think that your accelerator pump is failing, you need to have it checked out by a professional mechanic. An experienced mechanic can diagnose your acceleration problems and, if necessary, replace the accelerator pump.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

Symptoms of a Bad or Failing Flexible Clutch Hose
Common signs include difficulty shifting, low clutch fluid, and feeling no resistance at the clutch pedal.
Insurance Requirements for Car Registration in Kentucky
The Kentucky Transportation Cabinet requires that all drivers in Kentucky carry liability automotive insurance, or “financial responsibility” in order to operate a vehicle legally and maintain vehicle...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...


Related questions

Q: 1985 Buick Riviera doesn't start

Watch my video, "fixing the car that cranks and doesn't start up," and it will give you all the steps to go through. But basically, what you want to do is see if you have fuel going into the engine...

Q: My '65 F-100 lurches only when driven slowly.

Hi there. The symptoms that you are describing lead to the accelerator pump in the carburetor not pumping correctly at low rpm's and low speeds. Try adjusting the carburetor settings to be 100 rpm's higher and turn in the fuel...

Q: re assembly of my carburator , spring fell off

The little spring most likely goes to the needle and float. It attaches to the tip of the needle or float to keep the float from bouncing. You should be able to get a carburetor diagram in a repair kit...