Skip the auto shop - Our mechanics make house calls

Q: I installed a new fuel sending unit the gas tank is full and it shows empty when u take all gas out it shows full what could it be

asked by on

I installed new fuel sending unit an put full tank of gas in it an it shows empty when you take all the gas out it shows full its one of the sending unit that comes with the wire you have to spice what could be it be thanks

My car has 130000 miles.

It sounds like you put in an incorrect sending unit or it is defective and needs a replacement. The fuel sending unit will vary resistance from low to high resistance controlling the gauge. If the signal from the sending unit is opposite of what it should be then the gauge will work opposite of the way it should. I would recommend replacing the sending unit and make sure the new one works opposite of the one you have now. You may have to get the correct one from the dealer since sometimes the aftermarket ones do not always work. You can connect the sender and check it before installing it back in the tank.

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!
  • Home
  • Questions
  • I installed a new fuel sending unit the gas tank is full and it shows empty when u take all gas out it shows full what could it be

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: Having some serious coolant problems

Hello. If the car is overheating severely, the heads and/or block will warp and the engine will have to be rebuilt. Best not to drive it if you know it is overheating. If you are continually replacing coolant but it...

Q: Car not starting

The reason you are getting intermittent no start or stalls is due to the fuel pump or fuel pump module is bad. You should first start with the fuel system test when the no start happens. Remove rear seat and...

Q: oil hand keeps flickering had engine oil level sensor replaced

First off, we need to clarify that there is oil level and oil pressure. I'm not sure which one is flickering on your dash, but the one that is the most important to pay attention to is the Oil Pressure...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...