Skip the auto shop - Our mechanics make house calls

Q: why doesnt my fuel gauge show me how much gas is in the tank?

asked by on

When I pump gas my fuel gauge doesn't show how much gas is in the tank. Why?

My car has 178000 miles.
My car has an automatic transmission.

A: There are 3 components, and wiring involved...

There are 3 components, and wiring involved in a fuel gauge on your car. There is a fuel level sensor, also called a sending unit, the PCM (main engine computer) and the instrument panel.

The fuel level sensor is mounted in the fuel tank aside the fuel pump. It is the most likely part to cause your issue. Wires go from it to the PCM, and the PCM communicates the fuel level to the fuel gauge in the cluster. Any one of these parts, or wiring, can cause the gauge not to work. The problem will need to be diagnosed, and the repair made. If you would like a quote, consider YourMechanic. We come to you.

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: Gauges not moving

Hi. A no-start condition with no rpm while cranking would leave me to suspect that the coil isn't switching. This causes your car to not produce any spark, contributing to your vehicle not starting. I would have a certified mechanic,...

Q: Oil in coolant

First, you have to determine if it is engine oil or transmission fluid. If you have an automatic transmission, then there is a heat exchanger in your radiator. Transmission fluid runs there in two hoses. If it cracks, you will...

Q: Code p0421

Most mechanics will use a diagnostic scan tool to download the source of the error codes. In the case of the P-0421, we usually find that either the catalytic converter has run its course, or the O2 sensors are giving...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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.