Jump to content
SAU Community

Fuel Gauge Problem?

YangLIU
 Share

Recommended Posts

YangLIU Rising Star

YangLIU

Posted
Posted (edited)

Hello,

my car could run 330-350kms and 1/4 tank left on fuel gauge, and it needs about 45L to fill full. so it is about 13L/100km, it seems ok.

I know NM35 feul tank is 80L. my question is why i used 45L but the fuel gauge shows only 1/4 tank left? is there any problem with it?

btw, i never try to drive until empty light on. maybe i need to run once until empty light on?

Edited by YangLIU
Link to comment
https://www.sau.com.au/forums/topic/456433-fuel-gauge-problem/
Share on other sites
scotty nm35 Grand Master

scotty nm35

Posted
Posted

Depends on a few things. The fuel level sensors that reside in each side of the tank could need a clean, they build up a varnish from the fuel.

The fuel sometimes sloshes over to the other side of the tank, and the computer that works out the level from the twin sensors is a little stupid I think. Eventually the two sides level out and the gauge should read higher again.

YangLIU Rising Star

YangLIU

Posted
  • Author
Posted (edited)

Depends on a few things. The fuel level sensors that reside in each side of the tank could need a clean, they build up a varnish from the fuel.

The fuel sometimes sloshes over to the other side of the tank, and the computer that works out the level from the twin sensors is a little stupid I think. Eventually the two sides level out and the gauge should read higher again.

most time when i park the car for long time then start it, i found the fuel gauge is obviously then last time before turn off engine.

maybe i need to clean fuel level sensor?

btw, could you advise which type of fuel filter and fuel pump are suitable for NM35? it is a good chance for changing the fuel filter/pump with cleaning fuel level sensors together.

Edited by YangLIU
scotty nm35 Grand Master

scotty nm35

Posted
Posted

Any aftermarket pump will require the wiring be upgraded. I have 255's in stock if you need one for $110.

The filter and 2 x Oring part numbers will be in the M35 parts thread.

Clean the carbon on the sensors with contact cleaner, ethanol or metho.

YangLIU Rising Star

YangLIU

Posted
  • Author
Posted

Any aftermarket pump will require the wiring be upgraded. I have 255's in stock if you need one for $110.

The filter and 2 x Oring part numbers will be in the M35 parts thread.

Clean the carbon on the sensors with contact cleaner, ethanol or metho.

cool! i will arrange that when next service. also will contact you to buy the pump. thanks mate.

Hertz Donut Proficient

Hertz Donut

Posted
Posted

No idea, I haven't had the enthusiasm to check it more closely, could be a dirty sensor as mentioned. The car's been acting as a tool shed for the past few weeks so I've only just got it moving again (and took it for a 300km trip to celebrate). All I know is it operates as expected above 1/4 tank, then once it drops below 1/4 sometimes it'll bounce back up to just below 1/2. Shut it down and restart and it's back to normal.

  • 10 months later...
privatepang Apprentice

privatepang

Posted
Posted (edited)

Sorry to resurrect this thread. So just bought my M35 VQ35 Stagea recently and wanted thoughts as to whether the sender is the issue or the gauge.

Bought car and at the time, fuel gauage read 1/2 tank and didn't move much from 1/2 tank after about 100kms of driving

Parked the car for couple of hours, came back and car was hard to start but i didn't think much of it when it did start.

Car then reads 1/4 tank. Drove for about 6kms and car died. Ran to the closest servo and filled up with 5L jerry can, car now reads 1/2 tank again and looking at the estimate kms to empty it reads 188kms!!

Filled it up again at servo and filled up another 73litres and car now is reading full...

Hard to work it out I guess but thoughts?

Edited by privatepang

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • EndZee
      R33 Gts/-t Abs Module Wiring Schematic (not Gt-r)

      By EndZee · Posted

      Brooooo Please send ABS control unit schematic Please! R33 gts25t ABS (Its two plug ecu, black and white) wire colors possible? [email protected]
    • GTSBoy
      Boost cut after swap(RB25DET NEO) R34

      By GTSBoy · Posted

      Don't even try to run it on the stock ECU if you're going to have the boost controller bring boost above ~10 psi. I've already told you that. If you use the Nistune ECU, you will need to CAREFULLY read the available documentation for Neo tuning, and read some threads on the Nistune forums, to discover the various things you have to do to prevent the ECU from going bananas when the boost is too high. The is a table associated with th boost sensor that must be modified to prevent it from shitting the bed. This is just one of the things that you will need to do to the tune in Nistune, because the Neo turbo ECU will be expecting to see a number of things (such as the TCS) that are not there, and you have to block the DTCs on those. It is totally not surprising to me that you are having the problems that you are, but the solutions to these problems have been known for >15 years. So just get it done.
    • dyl33
      VOLK RACING GTC CENTRE CAPS

      By dyl33 · Posted

      Centre caps $250
    • Kapr
      Boost cut after swap(RB25DET NEO) R34

      By Kapr · Posted

      Hi. Sry iam not a mechanic and iam not at the car atm so i dont know 100% but they told they measure those and even try to change those. AFM they have two. Coils are new a they have my old one too. Plugs too. ECU...we have 25 NEO stock and Nistune 25 NEO.   But i dont know if any one those could be the problem and why/if/what can cause this, Only thing they did not check is fuel...but that walbro 255 is new(like 1,5 years)... That fuel pressure gauge idk...but i let them know Any suggestions?   EDIT: how can they know if it is like you say he ECU pull power when it reaches a specific boost level that is too high? Tha car has boost controler
    • Duncan
      Boost cut after swap(RB25DET NEO) R34

      By Duncan · Posted

      Can you clarify what you mean by boost cut, do you mean it misfires both when under load (driving) and when stationary and out of gear? Or does the ECU pull power when it reaches a specific boost level that is too high (boost control issue)? Does it occur at idle with no throttle? When you say "the ECU is OK", what ECU is it and why do you think it is OK? Have you used the NEO ECU, and if so do you have a MAP sensor attached? Same for the AFM, why do you think it is OK? Do you have any way to put a fuel pressure gauge on it (even just a mechanical one between the fuel filter and fuel rail)?
×
×
  • Create New...