Symptoms of a Bad or Failing Fuel Pump

Our certified mechanics come to you · 12-month, 12,000-mile warranty

GET A QUOTE Get a fair and transparent estimate upfront
Red-stars EXCELLENT RATING ON

Cost of Replacing a Bad or Failing Fuel Pump

Common signs include a whining noise, hard starting, engine performance issues, and an inability to start the car. Our certified technicians can come to you and diagnose the problem. You will receive a $30 credit towards any follow-up repairs that result from the diagnostic. Following are example prices for Fuel Pump Replacement. Click on the button below to get an upfront quote for your car.

Cars Estimate Parts Cost Labor Cost Savings Average Dealer Price
2012 Ford Expedition $626 $384.75 $241.50 17% $755.62
2014 Chevrolet Sonic $657 $506.78 $150.50 10% $737.90
2012 Chrysler Town & Country $583 $432.16 $150.50 12% $663.28
2009 Mercedes-Benz SL600 $923 $730.83 $192.50 10% $1026.45
2011 Mercedes-Benz CL600 $651 $514.01 $136.50 10% $723.63
2012 Maserati Quattroporte $556 $486.05 $70.00 6% $593.55
GET A QUOTE FOR YOUR CAR Get a fair and transparent estimate upfront

How to Diagnose a Bad or Failing Fuel Pump?

fuel pump

Virtually all modern vehicles that use internal combustion engines come equipped with fuel pumps. The fuel pump is the component that is responsible for delivering fuel from the gas tank to the the engine at the appropriate pressure required to meet performance demands. When the key is turned on, the fuel pump is activated and pressurized, which can be heard as a quiet whine or hum in some cars. The fuel pumps equipped on most modern vehicles are electric pumps that are mounted in the fuel tank. However, some vehicles are equipped with inline or mechanical style fuel pumps. Because the fuel pump is the component responsible for supplying the engine with the fuel required for it to run, any issues with it can cause major drivability and performance problems. Usually a bad or failing fuel pump will produce a few symptoms that alert the driver of a potential issue.

1. Whining noise from the fuel tank

One of the first symptoms of a problem with the fuel pump is a loud whining sound. An old or worn fuel pump may produce a noticeably loud whine or howl when it is running. Most fuel pumps will produce a quiet hum during their normal operation, however an excessively loud whine coming from the fuel tank is usually a sign that there is an issue.

2. Difficulty starting

Another symptom that is commonly associated with a problematic fuel pump is difficulty starting. Because of how they operate (constantly running whenever the ignition is turned on) over time fuel pumps can eventually wear out and weaken. A weak fuel pump may still pump fuel, however the vehicle may experience difficulty starting as a result of the lack in pressure. 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.

3. Misfires and a decrease in power, acceleration, and fuel efficiency

Another symptom of a problem with the fuel pump is engine performance issues. As the fuel pump is what supplies the vehicle with the fuel required for combustion to occur, any issues with it can affect the engine’s fuel supply and cause issues. A faulty pump with low pressure will disturb the engine’s air-fuel ratio, which can cause all sorts of performance problems. Aside from hard starting, the vehicle may experience misfires, a loss in power and acceleration, a decrease in fuel efficiency, and even engine stalling.

4. Car is not starting

Another more serious symptom of an issue with the fuel pump is a no start condition. If the fuel pump fails completely, or to the point of not being able to provide enough fuel for the engine to run, the vehicle will experience a no start condition. The engine will still crank when the key is turned, however it will be unable to start due to the lack of fuel. A no start condition can also be caused by a wide variety of other issues, so having the vehicle properly diagnosed is highly recommended.

Fuel pumps are found on virtually all internal combustion engine equipped vehicles in one form or another. Most fuel pumps are built to last, however over time, as the vehicle enters high mileage, it is not uncommon for fuel pumps to require replacement. Another reason fuel pumps fail is if you regularly keep less than 1/4 of a tank of fuel in your car. If your vehicle is displaying any of the symptoms above, or you suspect that your fuel pump may be having an issue, have the vehicle inspected by a professional technician, such as one from YourMechanic, to determine if the pump should be replaced.

Misfire
fuel system
Noises
fuel pumps

Fast and easy Fuel Pump Replacement service at your home or office.

GET A QUOTE FOR YOUR CAR
Get a fair and transparent estimate upfront

Recent Fuel Pump Replacement reviews

Excellent Rating


YourMechanic Fuel Pump Replacement Service

Average Rating

4.7/5

Number of Reviews

725

Rating Summary
672
28
6
4
15
672
28
6
4
15

Patrick

12 years of experience
254 reviews
Patrick
12 years of experience
very friendly!
2006 HONDA CIVIC - FUEL PUMP - RICHMOND, VIRGINIA

Jay

34 years of experience
566 reviews
Jay
34 years of experience
Jay is very knowledgeable and professional. He explained everything, works clean, and fixed the problem in one trip! Highly recommend him.
1999 CHEVROLET TAHOE - FUEL PUMP - MORENO VALLEY, CALIFORNIA

Dario

6 years of experience
58 reviews
Dario
6 years of experience
Helpful and informative
1993 HONDA CIVIC - FUEL PUMP - ATLANTA, GEORGIA

Matthew

30 years of experience
363 reviews
Matthew
30 years of experience
Excellent.
1991 MERCEDES-BENZ 300SE - FUEL PUMP - NORFOLK, VIRGINIA

More related articles

Symptoms of a Bad or Failing Timing Belt
Common signs include a ticking noise coming from the engine, an engine that won't turn over, engine misfires, and oil leaking in front of the motor.
How Long Does a Throttle Return Spring Last?
Not all vehicles on the road feature an electronic throttle control (ETC), which is also called drive-by-wire. For vehicles that don't offer this system, they have a throttle cable instead that...
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.

Related questions

Q: Intermittent misfire that sets a random misfire code and three injector circuit failure codes.

Hello. Intermittent and random misfires can be caused by many things. If all of those components check out, it may be possible that one of the fuel injectors is dirty or clogged, and is not delivering fuel properly. It may...

Q: No compression but spark is there, fuel goes good. What is happening? The car only cranks and doesn't start.

Hi there, thanks for writing in. Unfortunately, if there is no compression, you have internal engine failure. This could be piston ring failure. Generally, a used engine would be the order for the repair as the cylinder walls could be...

Q: Loud popping noise where header and exhaust meet

Hi there - the "combustion bang" you hear taking place at the header flange probably indicates a leak at the donut gasket as you suspect. Unburned, or still burning, fuel catches some fresh oxygen at the flange, and ignites, producing...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1-800-701-6230 · hi@yourmechanic.com