Fuel Gauge Inaccuracy?

Jason · 11-18-2009, 11:54 PM

update: i thought the issue fixed itself but today i thought i had 1/4 tank (4 dots) and the car shut off. had to get a friend to hook me up with 2 gallons of gas to get outta there. im buying that techron tomorrow. if that doesnt work then i guess i'll be going to the dealer for a new fuel sender unit or whatever the problem is. ugh, id hate to take it to a dealer! hopefully this techron does the trick!

Modshack · 11-19-2009, 10:22 AM

Quote:

Originally Posted by Modshack

Well....sloshing the fuel around in there with some Techron does work...He's not wrong! ....

Quote:

Originally Posted by Jason

update: i thought the issue fixed itself but today i thought i had 1/4 tank (4 dots) and the car shut off. had to get a friend to hook me up with 2 gallons of gas to get outta there. im buying that techron tomorrow. if that doesnt work then i guess i'll be going to the dealer for a new fuel sender unit or whatever the problem is. ugh, id hate to take it to a dealer! hopefully this techron does the trick!

Guess I was wrong there in assuming you acted on that...Just sloshing, No techron. If you'd taken my advice from 2 weeks ago it might be fixed by now!......

Jason · 11-19-2009, 08:45 PM

i thought it fixed itself when i saw more dots magically light up. no worries, i sloshed it around PLENTY of times with the techron in there today. i mustve looked like a maniac.

Crash · 11-19-2009, 09:19 PM

Quote:

Originally Posted by Modshack

Probably a little corrosion on the sender contacts from sitting. Throw a bottle of techron in the tank. Often that will help scrub them clean..

This is usually what happens. The issue has to do with sulfur building up on the sending unit contacts.

Quote:

Originally Posted by Jason

Woah woah mod, only Shell gets in this machine! Lol

Shell is known for having sulfur problems actually.

Quote:

Originally Posted by Rogue Z

I heard Chevron 91 is better than Shell 91

This is correct.

Also, guys, you should also know that if you're going to use the auto-fill on the handle of the pumps, you should use the lowest/slowest setting. The reason for this is that modern pump handles have a vapor evacuation channel that sends fumes back to the pump. When pumping at full speed, some of the gasoline will return through that channel and you will be charged for that gas that you're not actually getting. So your MPG calculations (if you do them by hand) will be inaccurate and you will over pay.

Using the slowest setting on the pump does not guarantee that none of the gasoline run back to the pump through the vapor channel, but there's far less chance of it.

BTW, you'll notice that many times the VERY bottom auto-fill setting (the slowest) is either cut off or disabled. They do this because they know that even if they get you for $0.01/gal more, they're going to make a significant gain in profit. Some gas stations know this and go out of their way to prevent you from using the slowest auto-fill setting. Some pumps will not let you pump that slow as well. (Greedy jerks. LOL)

Jason · 11-20-2009, 05:29 AM

good info. thanks!

Spec Jay · 11-20-2009, 07:01 AM

ive already actually had problems with the fuel level sender. thew a code for circuit voltage too high. seems like nissan has a new replacement part # out too.

Jason · 11-20-2009, 08:31 AM

hmmm... tell me more. did it just happen randomly? what is different about the new part?

370Zsteve · 11-20-2009, 08:37 AM

Quote:

Originally Posted by Modshack

Probably a little corrosion on the sender contacts from sitting. Throw a bottle of techron in the tank. Often that will help scrub them clean..

Techron ftw! The stuff is amazing. I've even used it to clear clogged fuel injectors.

+1 rep

370Zsteve · 11-20-2009, 08:40 AM

Quote:

Originally Posted by j.arnaldo

In my '04.5 Touring Coupe, it's a gas tank issue, not the fuel gauge. I read somewhere that the fuel vapors in the tank "fool" the shut-off mechanism in the fuel nozzle, which stops dispensing the gas. When you get into your vehicle, the fuel gauge is slightly below the "F". Weird Nissan bugs.

I heard that Nissan fixed that problem on the '05 Touring coupe, dude!

You missed it by six months............

Spec Jay · 11-21-2009, 04:39 AM

Quote:

Originally Posted by Jason

hmmm... tell me more. did it just happen randomly? what is different about the new part?

It happened after i topped off the tank. never had a problem doing so in my spec v but the 370 did it on my 3rd fill up. nissan is looking into the part for me.

Jason · 11-21-2009, 04:49 AM

How did they diagnose it? Do they just take your word for it? I assume they take voltage readings from somewhere.

Spec Jay · 11-21-2009, 05:00 AM

obd2 scanner/trouble codes.

feelzpwr91 · 11-21-2009, 05:17 AM

Basikly they messed up your CPU chip

Jason · 11-21-2009, 06:28 AM

Well I don't have a CEL. Probably a stupid question but is it possible to have a trouble code if there's no CEL? If so, I'll scan tomorrow to see if I have anything.

shumby · 11-21-2009, 07:33 AM

Had thus happen on my 09g and it was the file sending unit. It now is happening on the 09 fx too. Dealer will replace under warentiy

11-20-2009, 07:01 AM	#21 (permalink)
Spec Jay A True Z Fanatic Join Date: Apr 2009 Location: Bummerton Posts: 1,510 Drives: MtB 09 370z Rep Power: 19	ive already actually had problems with the fuel level sender. thew a code for circuit voltage too high. seems like nissan has a new replacement part # out too. __________________ 09 Monterey Blue Global Time Attack Street Class Build Build Thread:Saber! Instagram:@SpecJay

11-21-2009, 05:00 AM	#27 (permalink)
Spec Jay A True Z Fanatic Join Date: Apr 2009 Location: Bummerton Posts: 1,510 Drives: MtB 09 370z Rep Power: 19	obd2 scanner/trouble codes. __________________ 09 Monterey Blue Global Time Attack Street Class Build Build Thread:Saber! Instagram:@SpecJay

11-21-2009, 07:33 AM	#30 (permalink)
shumby Captin Canuck Join Date: Dec 2008 Location: with your mom Age: 44 Posts: 6,288 Drives: your sister Rep Power: 237	Had thus happen on my 09g and it was the file sending unit. It now is happening on the 09 fx too. Dealer will replace under warentiy __________________ Originally Posted by SAM@GTM Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living . Sam

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11-18-2009, 11:54 PM	#16 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	update: i thought the issue fixed itself but today i thought i had 1/4 tank (4 dots) and the car shut off. had to get a friend to hook me up with 2 gallons of gas to get outta there. im buying that techron tomorrow. if that doesnt work then i guess i'll be going to the dealer for a new fuel sender unit or whatever the problem is. ugh, id hate to take it to a dealer! hopefully this techron does the trick!

11-19-2009, 08:45 PM	#18 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	i thought it fixed itself when i saw more dots magically light up. no worries, i sloshed it around PLENTY of times with the techron in there today. i mustve looked like a maniac.

11-20-2009, 05:29 AM	#20 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	good info. thanks!

11-20-2009, 08:31 AM	#22 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	hmmm... tell me more. did it just happen randomly? what is different about the new part?

11-21-2009, 04:49 AM	#26 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	How did they diagnose it? Do they just take your word for it? I assume they take voltage readings from somewhere.

11-21-2009, 05:17 AM	#28 (permalink)
feelzpwr91 Enthusiast Member Join Date: Oct 2009 Location: RVA Posts: 311 Drives: 09 Black370z T M6 Rep Power: 197	Basikly they messed up your CPU chip

11-21-2009, 06:28 AM	#29 (permalink)
Jason Enthusiast Member Join Date: May 2009 Location: Florida Posts: 309 Drives: Nissan 370Z Rep Power: 16	Well I don't have a CEL. Probably a stupid question but is it possible to have a trouble code if there's no CEL? If so, I'll scan tomorrow to see if I have anything.