Skip the auto shop - Our mechanics make house calls

Q: Gas gauge doesn't work correctly and moves randomly registering wrong amount of gas

asked by on

Hello, I'm having troubles with my 2001 Sierra that has around 85,000 miles. The gas gauge seems to be working fine but sometimes it just starts registering wrong gas amount. Although I filled the gas tank, it indicates that it is empty. Then it works normally and shows the correct amount. But, occasionally it moves to full, if I am going downhill. This occurs while I shift from drive to neutral. It generally takes correct position when I shift to neutral. Other times it just moves randomly. When I took it to a mechanic, he said I have a worn-out fuel pump. It would be pretty expensive to replace as it is located in the gas tank. Do you have any ideas how to fix this thing?

A: Yes, the fuel sending unit is part of the f...

Yes, the fuel sending unit is part of the fuel pump module. If there is an open in the fuel sending unit this will can you the false readings you are experiencing. The tank will have to be dropped to complete this repair. You may want to enlist the help of a mechanic, such as one from YourMechanic, who can safely drain and drop the tank and replace the fuel pump assembly.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Smell coming from A/C vents

Hello there, a few different items can cause this type of smell in the vehicle. The most common is the heater core, but that has already been checked. Other likely causes would be an exhaust leak, fuel leak, or something...

Q: Advice on which type of gas to use on a 2009 Charger

It's probably okay if the car runs perfectly fine and you are not having any problems. The way you can really tell it is to pull off the spark plug and look at it. In a normal spark plug, there...

Q: Battery dies all the time

Hello. The first check you would have to do is look in the main fuse box in the engine compartment and verify all the big cables going into the box are clean and tight and all the fuses are good....

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...