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FIX for gas gauge fluctuations, hard to fill

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FIX for gas gauge fluctuations, hard to fill

Old 10-15-2014, 05:07 PM
  #41  
F2CMaDMaXX
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5 - 50 (Full to empty) Left side.

5 - 70 (Full to empty) Right side. This one has some *possible* question over the exact figures.


The important part is making sure that the numbers move smoothly across the range.
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Old 10-17-2014, 06:50 PM
  #42  
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Default my ohm ranges for the two are slightly different

Originally Posted by F2CMaDMaXX View Post
5 - 50 (Full to empty) Left side.

5 - 70 (Full to empty) Right side. This one has some *possible* question over the exact figures.


The important part is making sure that the numbers move smoothly across the range.
I went ahead and cleaned both resistors yesterday and got the following values

2.5 - 81.5 (Full to empty) Right Side - Passenger- Primary with fuel pump
1.9 - 43 (full too empty) left side - drivers - secondary no pump

The gauge started reading just above half, where it was reading at half before. After driving 134 miles it is reading slightly less than half.
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Old 10-17-2014, 07:02 PM
  #43  
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So i'm guessing that it's why yours isn't reading right. How smooth was the progression?
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Old 10-21-2014, 07:21 PM
  #44  
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Default The progression of the resistance was smooth.

Originally Posted by F2CMaDMaXX View Post
So i'm guessing that it's why yours isn't reading right. How smooth was the progression?
Those numbers were AFTER I cleaned them though.


The gauge is acting better. Will know for sure this week when I fill up. I am over 300 miles traveled with about 114 miles being displayed as DTE. My in car calculator says I'm averaging 24 miles to the gallon, so I would expect to see at least 12 gallons to fill it up. Assuming I went the final 114 miles that should be another 4.75 gallons used, so 16.75 gallons to fill up and to go 414 miles. Right now it is reading just slightly above a quarter tank.

I think the reserve is something like 2.5 gallons right?
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Old 10-23-2014, 05:32 PM
  #45  
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Doesn't really matter if it was before or after, cleaning isn't necessarily successful.

When i next pull mine, i'm going to use 1000grit on them.

Reserve/fuel light comes on at 50 calculated miles to go, which will obviously change based on your MPG at the time. At about 24 to the gallon, you'll get clear of 430+ before needing to fill up. I always get about 18 gallons used at around 420 miles and high 23's to the gallon.
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Old 10-24-2014, 04:55 AM
  #46  
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"When i next pull mine, i'm going to use 1000grit on them." Exactly what I did.

Filled up yesterday and it took 15 gallons, with 60 MILES DTE, so may be still a little off, or the result of cleaning the contacts with fuel still in the tank. I'm just glad I don't have a "hard to fill" issue.

The fuel gauge needle is sitting just above F, before it was at 7/8 full.

Not trusting the gauge all that much, just looking at miles traveled as my gauge.
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Old 10-26-2014, 08:10 AM
  #47  
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Originally Posted by CFAUVEL View Post
Not trusting the gauge all that much, just looking at miles traveled as my gauge.
I do the same. I know to fill up around 380-400 daily driving. I would just like the gauge to work so it doesn't say I'm out with 0 miles left at 180-200 miles.
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Old 10-26-2014, 08:30 PM
  #48  
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I ended up replacing my passenger side (fuel pump side) fuel sender unit after cleaning it multiple times with little to no results. I used to think the sender unit only comes with the fuel pump so I never got around to replacing it. A call to Nissan cleared that up. Now my gauge reads like it should.

Last edited by johnx818; 10-26-2014 at 08:30 PM. Reason: Typo
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Old 10-27-2014, 04:08 PM
  #49  
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Default Good news

Originally Posted by johnx818 View Post
I ended up replacing my passenger side (fuel pump side) fuel sender unit after cleaning it multiple times with little to no results. I used to think the sender unit only comes with the fuel pump so I never got around to replacing it. A call to Nissan cleared that up. Now my gauge reads like it should.
what was the part number and how much?
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Old 11-17-2014, 11:42 AM
  #50  
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Originally Posted by CFAUVEL View Post
what was the part number and how much?
parts.nissanusa.com
part code: 25060Y
online price $97 and some change
this was for a 2003, if that matters.
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Old 04-08-2015, 04:07 PM
  #51  
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Hi, I have a 2005 Z and was told (by autozone) that I need a new fuel tank pressure sensor. It looks like this (below). My question is, where is this sensor located? I assume it's somewhere near the gas tank right? I've also searched all over google and this forum, and no success.

Thanks

Amazon.com: Wells SU6854 Fuel Tank Pressure Sensor: Automotive Amazon.com: Wells SU6854 Fuel Tank Pressure Sensor: Automotive
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Old 11-05-2017, 06:35 AM
  #52  
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Wow, huge thanks to this site and this write up! Followed Moses' step by steps on the G35 site (with super helpful pics) and fixed the wonky issue! Only one skinned knuckle and 45 minutes later, both sensors were pulled, cleaned, reinstalled, and the gas gauge and DTE figures are right where they should be.

Massive gratitude!
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Old 11-12-2017, 06:03 AM
  #53  
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I have the same issue, fully filled up with 3/4 full showing on the fuel gauge. I followed the cleaning method, worked for a week and went back how it was. Eventually I replaced both fuel sending unit with new ones but getting no results(shocked, surprised and disappointed). Anyone could advise?
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Old 11-13-2017, 01:54 PM
  #54  
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Are you sure you're getting a full tank of gas in there when you fill up? Our tanks hold 20 gallons, but sometimes, the vapor vent tube will turn off the filler at the pump well before the tank is full.

https://my350z.com/forum/2003-2009-n...extension.html

Also, did you go with aftermarket or OEM sending units?
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Old 11-13-2017, 01:58 PM
  #55  
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I am surebthe tank is full and both of then sending units are oem new
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Old 11-13-2017, 02:39 PM
  #56  
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I know it's a pain, but you could check the resistance readings on the OEM senders on a bench and compare them to the spec ranges outlined in the FSM on the full sweep from empty position to full position. It could also be that one of the senders is getting hung up on its mount.
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Old 11-14-2017, 12:49 AM
  #57  
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May I know where (which chapter?) I could find the spec resistance readings range of the fuel sending unit? Also, was it like left side measuring the first half( 1/2 to full) of the tank while right side measure the second half (empty to 1/2 )of the tank?
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Old 11-14-2017, 09:32 AM
  #58  
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What's the model year and trim on your Z?
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Old 11-14-2017, 10:56 AM
  #59  
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For future posts where you ask for help with your car, always include year, trim, mileage and mods. It'll get you a faster response every time.

So rather than go back and forth on this one, here's a sample of the information that's available in the FSM for a 2006 Coupe (this info may vary from year to year, so be sure to pull the correct FSM for your application.) To find your FSM, check the sticky thread in the Maintenance Forum with the corrected link I added on page 2. This is from the DI section (for Driver Information System) under "Fuel Level Sensor Signal Inspection"

Again, these are the resistance readings you'd get off a 2006 coupe with a properly functioning fuel level sensor.

Fuel gauge indication Value on monitor [lit.]
Full Approx. 74
Three quarters Approx. 61
Half Approx. 42
A quarter Approx. 22
Empty Approx. 8
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