The fuel gauge always shows completely empty on my 2006 sedan. The low gas light still comes on but it'd be really nice to know before I have 4-5 gallons left.

So far I have:

1. Cleaned sending unit scale with a Q-tip
2. Checked voltage to sending unit
3. Checked resistance of sending unit along full to empty scale (0 to 80 Ohms IIRC)

Has anyone out there had this issue? Most of the posts are on a bad sending unit or an incorrect reading. Mine is always showing empty.

Thanks!

 

Have you followed the troubleshooting steps in the FSM?

http://www.nicoclub.com/FSM/G35/Seda...5_Sedan/fl.pdf

http://www.nicoclub.com/FSM/G35/Seda...5_Sedan/ec.pdf

EC 477
DTC P0460 FUEL LEVEL SENSOR
PFP:25060
Component Description
NBS001E9
The fuel level sensor is mounted in the fuel level sensor unit. The
sensor detects a fuel level in the fuel tank and transmits a signal to
the combination meter. The combination meter sends the fuel level
sensor signal to the ECM through CAN communication line.
It consists of two parts, one is mechanical float and the other is vari-
able resistor. Fuel level sensor output voltage changes depending on
the movement of the fuel mechanical float.

http://www.nicoclub.com/FSM/G35/Seda...5_Sedan/di.pdf

DI 5

FUEL GAUGE
The fuel gauge indicates the approximate fuel level in the fuel tank.


Combination meter reads a resister signal from fuel level sensor.
Signal is supplied
–
through grounds M30 and M66
–
through terminals 5 and 2 of the fuel level sensor unit and fuel pump (main) and
–
through terminals 2 and 1 of the fuel level sensor unit (sub)
–
to combination meter terminal 7 for the fuel gauge.


Combination meter indicates the approximate fuel level according to the resister signal from fuel level
sensor

Might be an open or poor connection in the wiring harness?

Good luck

Telcoman

 

Thanks a ton!
I'll check those resources out.

(will post results)

 

After a year without cleaning, I finally found time to wash, and wax my 2003 Infiniti G35 Sedan. I spent the day detailing my vehicle, and afterwards time to drive the newly minted car out of my garage. After starting the car, the “Service Engine Soon” light illuminated with the gas gauge indicating empty. I had filled the vehicle the evening before. I pondered what I could have done while applying wax to the car. Did I get water somewhere where it should not have been, but how? Did I have a hole in my gas tank?

Incidentally, about two weeks earlier, I noticed that the fuel tank door would no longer lock. I would spray lubricant on the door actuator pin and that seemed to help for a bit. Unfortunately, that issue was intermittent. Actuators are expensive, and thankfully I hadn’t purchased yet.

So, I am now sitting with this immaculate clean vehicle, a full tank of gas indicating empty that won’t accelerate past, maybe 3-miles per hour. I spent time on the computer researching and just didn’t think it was the fuel sending unit. Thinking something became wet, I thought I would wait for everything to thoroughly dry.

My wife arrived back home and started research of her own, and was adamant it was a fuel sending unit. Late in the day, I decided to investigate. I snapped the rear seat out of the back of the car which was easier than I anticipated. Two retaining pins, pull forward and gently raise up the seat. The passenger side of the vehicle is where the fuel pump is located. I removed the top of the container, positioned with four screw tabs. The first thing I noticed was two broken wires from the fuel sending unit within the wire harness. I touched the wires together, as my wife watched the fuel gauge. The gauge indicated properly, and the vehicle power revved -up. I spliced the wire together. I also found another wire frayed and fixed that, which happened to be for the fuel door actuator. Now, everything works as advertised, fuel indicates properly, and car accelerates normally. I did not have much luck clearing the Service Engine Soon light with the accelerator dance so I borrowed a code reader and cleared the fault. I contributed to that by accidentally starting the car with the fuel sending sensor detached. That indicates a high voltage sensing code. Oh, and the car won’t start either.

I want to thank my wife for encouraging me to look into the fuel sending unit. I was expecting to have the car towed to Infiniti and pay a premium for the diagnostic and repair. Why the wire was frayed or broken remains a mystery. No indication of any rodents. I now think it’s due to the poor roadways in California, with the constant vibration.

For those with fuel gauge issues, gently pull back the sheathing on the wire harness under the back seat. You may notice a broken or frayed wire which is an easy and inexpensive repair.

By the way, I just had the car smogged the day before!



Fresh wax and ready to go - still need to order new center caps!

 

So is the car running normally now or did you say it WON'T START ?

 

The car is running normally, accelerates like a G35 should. I had another issue where the radio and environmental controls all simultaneously quit working. The radio console was easy to remove and soldered a loose connector on the main board which is neatly put in the radio housing. With 70,000 miles, drive and looks great! Thank you!