Skip the auto shop - Our mechanics make house calls

Q: Gas gauge needle fluctuates up and down

asked by on

We just bought this car yesterday, it has 110,000 miles but was checked out by our mechanic and he gave us an excellent report. We had to put fuel in so we filled it up and drove 6 miles home. In that short period the needle fluctuated from full-over full to 3/4 a tank! I know these cars are supposed to get good gas mileage so what would cause the needle to do this? We are still within our 72 hours return so I am looking for a quick answer. Thank you!!!!
My car has a manual transmission.

A: This may possibly be a faulty fuel tank sen...

This may possibly be a faulty fuel tank sending unit. This is a float type designed sending unit that sits inside your fuel tank that monitors the fuel level inside the tank. When this is faulty or failing it can cause intermittent changes in the fuel gauge to register as you describe.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Low gas mileage

Real world mileage numbers very rarely stack up to those advertised by the manufacturer, but 13 MPG does seem very low. There are several things you can do to improve your mileage. First, make sure your tires are properly inflated...

Q: My turning signals work but they cut back off

Hello there, without more information I am unable to offer anything other than general advice for your 2003 Saturn L200. When you say cuts on and off I am going to assume this means the turns signals shut of by...

Q: How do you leave the car with a valet?

If you’re going to use a valet, it’s important to understand the process set forth by Nissan. You’ll need to actually give the valet your Intelligent Key, but you should keep the mechanical key. You may want to disable the...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...