Skip the auto shop - Our mechanics make house calls

Q: After fuel pump replacment, car uses more gasoline

asked by on

My car has 25,000 miles and the fuel pump went out, so I had it replaced. Now the car seems to be using more gas than it did before the replacement. To explain: the dots on the fuel gauge move down quickly, but the gauge itself still indicates that the car is getting 25-26 mpg. It just isn’t making sense. I have driven my car for several years and I am always aware of how much gasoline that my car uses and recently it is literally drinking it. Before I call the service center, can you tell me if this sounds like this might be a problem resulting from the fuel pump replacement?

A: There is always a chance of something going...

There is always a chance of something going wrong with a repair, but let's not start there. There may be a new concern, such as a vacuum leak or a sensor causing false readings. Since there was a recent repair, start the diagnosis by double checking the work, and if there are no faults found, the next step would be to check the engine seals and electronics. If you would like this checked for you, a local expert from YourMechanic can come to you to inspect the perceived decrease in mileage in order to have this resolved.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Intermittent malfunction of electrical components - 2007 Mercedes-Benz SLK350

The ignition switch can fail (internally) in this fashion, failing to make proper electrical connections sporadically. Have the ignition switch checked, and if necessary, replaced. A YourMechanic professional can inspect your vehicle and replace your ignition switch.

Q: Fuel line or spark plugs at fault. Car won't start, even with a jump.

Get this problem inspected by a mechanic. The most likely failure will be the fuel pump and filter. I would recommend you have a certified technician check for fuel pressure and replace the fuel pump and filter. If the fuel...

Q: I would like to collect brake pedal position information from my OBD2 port. Can this be done?

The brake pedal position does not have a specific wire to the OBD2 connector that can be monitored. You could however monitor the data stream and get the brake on or off PID in the data monitoring. The PID will...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.