2005 G35X -- fuel gauge usually goes straight to "full" when key is turned on. Sometimes will read 1/4 tank more than is actually in the tank. The gauge itself seems to be working. Per a few YouTube videos, I removed both the left and right sensors and cleaned the very light build-up off of the contacts. Upon start-up, the gas gauge goes to FULL . I suppose I need to replace the sensor but I don't know which one sends the fuel level signal to the gauge and if the other one is the "low fuel" warning indicator.
Any "pointers" would be greatly appreciated.

Thanks,

Frank

 

You obviously did not spend very much time searching prior to posting?

https://g35driver.com/forums/m-spot/...ml#post7144252

Grab you multimeter and test the resistance of the sensors

Telcoman

 

Telcoman:

Thanks for the quick reply and very helpful link!

I'm an old guy who remembers when cars only had one float in the gas tank! SURPRISE!!!

I was just hoping someone could tell me which of the two float/sensors sends the fuel level signal to the gauge and I would just buy a replacement. Then I would only need to tear into the car once.
I really didn't want to replace both sets if only one was bad. I was thinking that perhaps the two float/sensors meant that one was for fuel level and the other was for the low-fuel indicator. If that's true, I don't know which of the two is the fuel level one.

I had just located this website and got a large pop-up window that said: "Ask a Question" and so I did. I kinda thought it was an online chat/help line so I didn't do a search. I'm sorry about that.

Thanks again,

Frank

 

Frank no harm no foul, your question is a commonly asked one and our forum rules do state to search for answers before posting questions. However in this case you just followed the process as it guided you so I understand why the question was asked.

Honestly I don't remember after being here so long (I'm an old guy too) which unit under the back seats controls the fuel level but I've linked you to a page of threads that will help figure out your issue. Look for the thread started by turTLe titled "Fuel gauge problem. Detailed." Let us know how it all works out and welcome to the family, this forum is the best source of information on the Internet you will find on all things G.

https://g35driver.com/forums/search....rchid=17787601

 

Blue Dream:

Thanks for the info!!!

I've had to put that on hold...........apparently a possum decided to hang out between my fan belt the other day.......argh.

Thanks again,

Frank

 

No worries, I've learned more about our G in the 9 years I've been here than I would have ever expected. The journey's been a blast, she's at 147K miles and I've done most of the R&M on the car in that time. When I bought her in 09 I had absolutely no idea how to do anything on the car but it's been a rewarding experience to fix most of her issues. The car's the girlfriend's now and she actually works on the car with me at times, she's awesome like that!

 

pretty smug response to someone asking an honest question just looking for some help. i didn't realize if you know everything and are smarter than everyone, then you automatically get to be a dick to anyone you're superior to. I'm going to take a wild guesss that you don't even respond to questions that don't provide an opportunity for you to condescend to someone lol... You're like Jimmy Fallon's IT guy on Saturday night live- You know a decent amount, but you don't have a thimble's worth of social skills, you have no friends and never get laid, And everybody ****ing hates you. 😆

 

We're sorry this 8-year old thread has upset you. There are some very smart people in here who know a LOT about our cars. But sometimes they get tired of answering the same questions over and over again when there are multiple threads already discussing the issue. That's all that really happened here. Maybe not the kindest initial response but try not to be offended or take it down into the hole any further by name calling ... on your first post...

 

Dude signed up just so he can rage post about an 8 year old thread

 

He did/does respond like that a lot though.... there's always people like that (snarky/belligerent) on anonymous forums and a few of the really special people even act like that in real life. My father in law was like that. No filter that most people have that keeps them from saying every thing that comes to mind no matter how rude or unhelpful it might be. Even the mod on the Murano forum I'm on responds similarly and gets on everybody about their spelling and punctuation. The dude that came on to rage about it must be young and hasn't run into all those people online yet....

 

Are u guys talking about the first reply from Telcoman? It doesnt seem that bad of a post

 

The first line of that post just isn't necessary or helpful. It's presumptuous (maybe the poster searched unsuccessfully) and condescending (obviously, very little). It doesn't contribute anything positive to the conversation and it's easy for me to understand why the new guy felt like that after reading it. It's clearly intended to make the poster feel he's violated some kind of rule and deserves to be called out and publicly shamed for it. The new guy will realize sooner or later that the online world is full of people that act like this and their experience or special knowledge give them some sense of superiority and in case someone's not aware of that superiority, they're happy to make others aware of it. There are a number of regulars here with tons of experience that they share more often and are more helpful and without that little shot of braggy negativity. That guy displays that more than any of the other regulars that I recall. Doesn't bother me enough to make my own rage post but the unhelpful condescending negativity is obvious. Seems like our world is really getting full of personalities like this lately. Getting way off the fuel gauge topic but I'll bet I can guess who that guy votes for and will also bet he is indeed not fun at parties.

Not sure if the new guy found this thread because he has an incorrect fuel gauge I think there's a much better thread for fuel gauge reading incorrectly. I think this thread: https://g35driver.com/forums/g35-sed...tailed-10.html was much more comprehensive and more likely to solve more posters problems. I get the impression that relatively few of the incorrect fuel gauge problems are really due to the senders (of course you need to check them though). Most posts I recall all start with "i replaced both senders and still have the same problem". I think the combo meter resistors are far more likely to cause bad fuel gauge readings.

 

Greetings. I have great experience with the infamous fuel gauge problem on Infiniti G35X. My daughter had a 2008 G35X that I absolutely loved so I spent a lot of time working on her car until she locked up the engine and we just recently scrapped the car in June 2025. For the first several years of her ownership of her car, the fuel level reading on the gauge on the front instrument cluster was never reliable, and she ran out of gas on at least three occasions. I cleaned the existing fuel sending units, but that didn't help. I replaced them with used OEM ones that I pulled off another G35X at a junkyard, but that didn't help. Then I replaced them with used OEM ones that I bought from somebody on ebay, but that didn't help. Next, I refocused on the instrument cluster. I removed the instrument cluster from her car and took it to two guys that specialize in instrument cluster repairs in their basement shop. They couldn't find anything wrong with her instrument cluster. I bought a used OEM instrument cluster on ebay and installed that one, but the inaccurate fuel gauge persisted. I spent countless numbers of hours searching the internet and this forum in search of the answer. I was dumbfounded how many G35 lovers have suffered with the same problem, but I could never find a solution. I bought access to drawings from Infiniti and finally deduced the potential problem to a heat amplifier control module (p/n P:27760 JK700 that is mounted on top of the center stereo module. I spent countless more hours trying to locate a new one of those modules. I would frequently check with local junk yards and ebay and google in search of one. After several months my persistence paid off because I found a used OEM one. It only took me about 30 minutes to install it. I wish I video taped the procedure. Once I installed the used OEM AC Heat Amp Control Module P:27760 JK700, the fuel gauge worked correctly for the next 4-5 years until we scrapped the car . Before the tow truck arrived, I pulled that module moments only before the tow truck arrived because somebody out there needs it, and you'll be lucky to find another! The attached four photos beginning with s-l1600 are the actual ones from the ebay posting where I found the used module. The fifth photo entitled "Infiniti G35X OEM AC Heat Amp Control Module P 27760 JK700" is the module as fitted on the computer assembly that I removed from my daughter's car. Trust me, this is the answer. I've never used this forum before and I haven't investigated how to DM yet and I'm hesitant to post my name, email address, or phone number yet because I don't want to attract spam, but if somebody out there who has been enduring the fuel gauge problem who is mechanically inclined and ambitious enough to finally fix it, feel free to drop me a message. I have the module and I could probably point you in the direction of a YouTube video that shows you how to remove the center computer that is tucked behind the stereo button panels. Rgds, Andrew

 

Something similar happened to me, and it turns out it was an issue pertaining to the actual electronic circuitry in the instrument cluster. After you rule out fuel issues do a search relating to issues pertaining to the instrument cluster. I found a guy here where I live in the Bay Area that was able to take out the cluster and do some soldering and de-soldering and fix it anyways good luck to you.

this was in my 2006 G35x