Skip the auto shop - Our mechanics make house calls

Q: Fuel gauge stopped working - 1972 Pontiac Grand LeMans

asked by on

The fuel gauge has stopped working. I keep running out of gas because of this. I tried to fix it by replacing the sending unit in the tank. The unit has prongs on the top and the bottom, as well as two on the back. I was wondering whether there are any wires that connect to the prongs on the back of the unit. How can this be fixed?

Hello there, thanks for writing in. A faulty sending unit can be problematic for your 1972 Pontiac Grand LeMans. When the fuel gauge is not functional, there are 3 suspected components: the sending unit, wiring for the gauge and sending unit, and the fuel gauge itself. To answer you question, there should be wires running to the fuel sending unit, otherwise it would be unable to get the signal to the fuel gauge. If the wires are intact and the sending unit was replaced, then there is a problem with either the wiring or the fuel gauge itself. If you’d like some help, consider having one of our certified automotive technicians assist you with a fuel gauge sender repair.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: Side lights and tail lights - 1997 Volvo S90

Hello. It sounds like you either have a circuit failure or the main switch is failing. Most of the time it is caused by the switch assembly. Either way, this would need to be diagnosed with a voltage meter. Though...

Q: Dash gauges acting weird.

I can't give you much advice without knowing which warning lights are coming on. As far as the oil pressure gauge is concerned, it could be a problem with the oil pressure sending unit, the sending unit circuit or the...

Q: car won't start

The electronic noise is most likely the fuel pump operating. The gas smell is concerning. A fuel leak could be dangerous and the risk of an engine compartment fire could result if the vehicle operates for any period of time....

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...
What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...