Q: The fuel gauge moves up and down I never know how much gas I have

asked by on

I would like to know what is wrong with it . It says full then it goes all the way down to empty . What is the part I need to replace and where is it located
My car has an automatic transmission.

The fuel sending unit is in the fuel tank mounted to the fuel pump assembly. The sending unit is shorted or open and needs to be tested using a gauge tester or by removing it and measuring the resistance of the sender by hand to see if it is working correctly. If you want to have this looked at, a technician from YourMechanic can come to your home or office to inspect the electrical wiring in your car to see if there is a simple fix, or if the car will need a sending unit replacement.

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. The fuel gauge moves up and down I never know how much gas I have

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: location of knock sensors

The knock sensors are on opposite sides of the engine. Bank 1 is just above the oil drain plug, on the engine block, at the front of the engine. Bank 2 is on the back side of the engine, in...

Q: Brakes lock up during driving, if the car is stopped fast

Hello. If the vehicle has anti-lock brakes, then it should not lock up like this. This will only occur if there is a sensor problem with the vehicle. I would start by installing a scan tool that can read the...

Q: Sputtering and popping with a loss of power. Most recently died and after driving cat converter was cherry red hot.

Hi there. There could be an issue with the spark plugs not firing causing excessive amounts of hydro carbons (raw fuel) to go into the exhaust system. When excessive fuel goes into the exhaust system, the catalytic converter will glow...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
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...