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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Gas gauge needle fluctuates up and down

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: Q: Gas mileage down

First off, spark plugs are not going to affect fuel mileage. Also, how are you checking fuel mileage? If you are using the indicator on your dashboard or overhead console, this isn't perfectly accurate. The only accurate way is to...

Q: What is the best fix for a catalyst system efficiency below threshold (bank 2)

Trouble code P0430 is for a catalyst on the drivers side. The sensor after the converter may be bad and not responsive enough or the catalyst itself may be bad. The catalyst should be replaced if the converter rattles, there...

Q: When the slip indicator light comes on, The car shakes bad and I have to pull over turn it off and turn it back on.

The vehicle's shaking may be caused my improper signals going to the traction control system and in return the traction control system is trying to correct a problem based off of improper signals. This may happen to the anti-lock braking...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.