Fuel Pump Repair

How does a fuel pump work?

A car’s engine burns a mixture of fuel and air to produce energy. Fuel is pumped along a pipe from the tank and mixed with air in the carburettor, from which the engine sucks in the mixture. A fuel pump draws petrol out of the tank through a pipe to the carburettor. The pump may be mechanical worked by the engine – or it may be electric, in which case it is usually next to or even inside the fuel tank.


A mechanical fuel pump is powered by the camshaft. As the shaft turns, a cam passes under a pivoted lever and forces it up at one end. The other end of the lever goes down and takes the diaphragm with it. When the lever goes down, it creates suction that draws the fuel through the fuel pipe and into the pump. The diaphragm can move up only by expelling petrol from the chamber. The petrol cannot go back through the first one-way valve, so it goes out through another one leading to the carburettor. An electric fuel pump has the same diaphragm-lever arrangement, but instead of the camshaft, a solenoid (an electromagnetic switch) provides the pull on the diaphragm. The solenoid attracts an iron rod that pulls the diaphragm down, drawing petrol into the chamber. 


How do I know if my vehicle needs a fuel pump repair?

The following are some symptoms of a faulty fuel pump:

  • Whining noise from the fuel tank.

If you hear a screeching or whining noise coming from the fuel tank while the car is running, there may not be enough fuel, a damaged pump, or a contaminant in the system.

  • Difficulty starting.

Fuel pumps can eventually wear out and weaken over time because they are constantly running whenever the ignition is turned on. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start. A weak fuel pump may still pump fuel, but the vehicle may experience difficulty starting from the lack of pressure. 

  • Engine sputtering.

If you are driving at a consistently high speed and your engine suddenly starts sputtering before returning to normal, this means that the fuel pump cannot provide a constant stream of fuel to the engine at the ideal pressure.

  • Stalling at high temperatures.

Stalling with a combination of a high internal temperature in your vehicle probably means there is a problem with your fuel pump’s motor. 

  • Loss of power under stress.

If you experience a loss of power when you are driving uphill, carrying a heavy load or even while accelerating, this indicates the fuel pump is weakening because it cannot keep up with the higher demands of your vehicle. 

  • Car surging.

Irregular resistance inside the fuel pump motor may cause vehicle surging, which indicates a fuel pump in need of repair. Surging feels like the gas pedal has been used. However, it occurs at a random, consistent speed. If this happens often, it may be because of problems within the fuel pump.

  • Low gas mileage.

A valve inside the fuel pump may not be opening, causing more fuel than necessary to pour into the engine system which could cause you to fill your vehicle with fuel more often than usual.

  • Car will not start.

If the fuel pump fails completely, the vehicle will refuse to start. The engine will still crank when the key is turned, but it will be unable to start due to the lack of fuel. A no-start situation can also be caused by a variety of other issues, so having the vehicle properly diagnosed is highly recommended.


If you are experiencing one or more of these symptoms with your vehicle, you can bring your car to Auto Tech Service Center in Conyers to get it fixed up.


Your Trusted Shop for Fuel Pump Repair

We at Auto Tech Service Center in Conyers are experts in all things auto repair. We’ve been fixing cars since 1990 and our team has decades of combined experience. Here are some reasons you should choose Auto Tech Service Center in Conyers:

  • We are dedicated to customer satisfaction.
  • We perform high-quality diagnostic and repair services at a fair price, using quality NAPA parts.
  • We exercise reasonable care for the customer’s property while it is in the shop’s possession.

To schedule an appointment with Auto Tech Service Center in Conyers, give us a call at 770-922-1480 or schedule an appointment online.

The Strength of Auto Tech Service Center

  • ASE-Certified Technicians on Staff
  • Give confidence and reassurance in our work, people, and parts, backed by our 2 year/24,000-mile warranty
  • Maintain a professional, friendly, and clean work environment, with well-spoken technicians and staff

For honest and efficient auto repairs in Conyers,, GA, turn to the capable team at Auto Tech Service Center. “Life's too short to drive boring cars.”

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