2017 Nissan Rogue fuel gauge

[teg916]

2017 Nissan Rogue S, about 91K miles.

I am having an issue with the fuel gauge once in a while, and it seems to be getting more frequent. I will be driving along with plenty of fuel, and the gauge randomly drops to 1/4 tank. I might have 3/4 or 1/2 a tank of fuel. The distance to empty does not change. It seems like it goes back to normal after I turn the car off and back on again.

I have done some research and read a few threads. There appear to be 2 fuel sending units in the gas tank. One on the left, and one that is attached to the pump on the right. Any suggestions on how to find out which of the two senders is bad? I could change them both, but parts for the both of them run about $650 from the dealer. About $550 from Ebay. This includes replacing the seals which I plan on doing when I get in there.

If I can determine which sending unit is bad, it would be great to save about $300. Has anyone had the same issue or have advice on troubleshooting the problem?

[VStar650CL]

You need to pull the pump and sub-sensor to isolate where the problem is, there's no way to do it with them connected. Ohm the sensors, the main should read about 45 ohms full and 141 ohms empty, the sub should read 6 ohms full and 141 ohms empty. They're connected in series, so to validate the cross wiring, reconnect the sub to main and measure again. You should see the sum of the two floats, 51 ohms full and 282 ohms empty. Run the floats up and down slowly looking for glitches in the readings, if you find any then that sensor is probably your culprit.

If you don't find anything with the senders, check for voltage on pin 5 at the F/P connector pin 5 with the key on, it will be either Lavender/Blue (Korea make) or Green/Blue (US, Japan make). It's probably 5V but might be battery voltage, but it shouldn't be zero. Then ohm pin 2 to the chassis with the key off, Lavender/Black (Korea) or Green/Black (US, Japan). That should read continuity (near zero ohms). If either of those readings are off, there's a wiring issue between the floats and the cluster. The most likely culprit for wiring is corrosion in the big SMJ connector near the passenger kick panel, which mates the #2 Body harness to the Main harness.

[teg916]

Great info, thank you. I just have to find the time to dig in and do the checks. I assume the problem is most commonly caused by the fuel senders.

[VStar650CL]

I assume the problem is most commonly caused by the fuel senders.

Correct.