Q: gas gauge goes up and down while driving on flat roads

asked by on

my infinti g35 is not getting the best of gas mileage or something is wrong with my fuel gauge it has been tested it has power it is just not accurate sometimes i notice when i fill up my tank it stops at 7/8 of tank on the gauge it wont go to full like normal cars would so when i driving on a flat road that is even my gas gauge will start to go down like i lost fuel then comes back up on its own to the same spot were it was not sure what to change or have looked at this point this issue is really getting frustrating not knowing how much gas is left before empty last time i was at the pump i filled up the pump stopped i started my car and it went to 7/8 full instead of all the way full like its suppose to i thought it needed more gas but no it started over flowing out my tank when i did that so that let me know then i was full but when i left it still stayed at 7/8 sometimes i come back out to start my car my gas gauge will register under 7/8 begin driving a few miles and its at 7/8

My car has 139000 miles.
My car has an automatic transmission.

The most common cause of erratic fuel level is caused by a defective fuel level sender in the fuel tank is defective or out of position or restricted from going all the way up to full position. I would recommend replacing the fuel sender in the fuel tank and at same time replace fuel pump and filter so you do not have to pay for additional labor in the future to replace pump or filter.

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 goes up and down while driving on flat roads

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: My car had a clicking noise on startup. I replaced the timing chain, guides and tensioners but the noise is still there.

Many engines will make a small ticking sound upon startup when cold due to the fact that the engine oil has dripped down to the oil pan or the bottom of the engine. When the engine starts up, oil pressure...

Q: I am having issues with my ABS/AWD and car is in safe mode

The U1000 code is the focus of a Nissan Technical Service Bulletin (TSB) and thus the applicability of that TSB should be considered first. With multiple codes and some implicating controllers and basic CAN functions (U1000), the Factory Service Manual...

Q: I have a 03 Infiniti g35... And the temp gauge needle wont go all the way down and it sticks when i turn the car off

Hi there. Quite often this issue is caused by a malfunction of the radiator temperature sensor, which is located on the top of the radiator neck. In some cases, the electrical harness that connects the sensor or the sensor itself...

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...
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...
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...