Results 1 to 13 of 13

Thread: "FUEL" light problem

  1. #1
    DX User 1stgen!!!'s Avatar
    Join Date
    Jan 2011
    Vehicle
    79 Accord sedan SJ5
    Location
    Brazil
    Posts
    60

    "FUEL" light problem

    hey guys
    i'm having alittle problem with my reserve fuel light, it never turns off!
    what is going on with my fuel float?

    thanks for any help



  2. #2
    2.0Si User Hazwan's Avatar
    Join Date
    Feb 2006
    Vehicle
    86 Honda Prelude
    Location
    Malaysia
    Posts
    3,846

    Re: "FUEL" light problem

    Mine never works haha but is your fuel gauge working fine?

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  3. #3
    DX User 1stgen!!!'s Avatar
    Join Date
    Jan 2011
    Vehicle
    79 Accord sedan SJ5
    Location
    Brazil
    Posts
    60

    Re: "FUEL" light problem

    sometimes when fill up the tank, he marks empty...then suddenly it returns to working...

  4. #4
    DX User reYmo's Avatar
    Join Date
    Jun 2011
    Vehicle
    1st gen Accord , 1980
    Location
    Indonesia
    Posts
    41

    Re: "FUEL" light problem

    as far as I know, there is a separate device for fuel light, which embedded to fuel float.
    or, there is another small float attached to fuel float.
    that little float must be stuck, take them out of your fuel tank to inspect.
    sometimes a little knock-knock at the fuel tank solve it.

  5. #5
    LX User 1GCustomAccord's Avatar
    Join Date
    Jun 2008
    Vehicle
    79´Accord,83´Lude,71´Nova coupe,83´Pontiac 6000,69 Mustang coupe,and many more rusted crap...
    Location
    PY
    Posts
    350

    Re: "FUEL" light problem

    Before changing the thermistor or complete sending unit you first need to check the system. Test the low fuel lamp by grounding the thermistor wire under the back seat with the key in ignition, (i think is a green/red wire) if the lamp lights up, the thermistor is bad, if not, the lamp is burnt or the wire is broken somewhere.

    The sending unit in the fuel tank is in fact 2 devices, a float with a resistor attached, and a THERMISTOR (basically a resistor in a bullet-shaped case) for the low fuel light.

    The working principle of a thermistor is temperature: When the fuel is high, the thermistor is submerged and is cold, having very high resistance (around 1500 ohms @ 25 celsius) so no current flow. When the fuel gets low enough, the thermister is not submerged in fuel and the temperature rises, so resistance drops, so current flows, so lamp lights up, so you go to the nearest gas station.
    So many reasons why
    I won't be sending postcards
    From Paraguay

  6. #6
    2.0Si User Hazwan's Avatar
    Join Date
    Feb 2006
    Vehicle
    86 Honda Prelude
    Location
    Malaysia
    Posts
    3,846

    Re: "FUEL" light problem

    Woot thanks for the info! I never bothered to check why its not working before haha.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  7. #7
    DX User reYmo's Avatar
    Join Date
    Jun 2011
    Vehicle
    1st gen Accord , 1980
    Location
    Indonesia
    Posts
    41

    Re: "FUEL" light problem

    Quote Originally Posted by 1GCustomAccord View Post
    Before changing the thermistor or complete sending unit you first need to check the system. Test the low fuel lamp by grounding the thermistor wire under the back seat with the key in ignition, (i think is a green/red wire) if the lamp lights up, the thermistor is bad, if not, the lamp is burnt or the wire is broken somewhere.

    The sending unit in the fuel tank is in fact 2 devices, a float with a resistor attached, and a THERMISTOR (basically a resistor in a bullet-shaped case) for the low fuel light.

    The working principle of a thermistor is temperature: When the fuel is high, the thermistor is submerged and is cold, having very high resistance (around 1500 ohms @ 25 celsius) so no current flow. When the fuel gets low enough, the thermister is not submerged in fuel and the temperature rises, so resistance drops, so current flows, so lamp lights up, so you go to the nearest gas station.
    Genius!!
    I never check mine also....maybe because I never run out of fuel. but since I had this car, that light NEVER goes on...
    Thanks for the info!!

  8. #8
    DX User 1stgen!!!'s Avatar
    Join Date
    Jan 2011
    Vehicle
    79 Accord sedan SJ5
    Location
    Brazil
    Posts
    60

    Re: "FUEL" light problem

    life is funny someguys never seen the light on
    and i always see mine on... at night that strong red light ,that haven't dim function, obfuscates me...

  9. #9
    LX User 1GCustomAccord's Avatar
    Join Date
    Jun 2008
    Vehicle
    79´Accord,83´Lude,71´Nova coupe,83´Pontiac 6000,69 Mustang coupe,and many more rusted crap...
    Location
    PY
    Posts
    350

    Re: "FUEL" light problem

    Welcome guys!
    So many reasons why
    I won't be sending postcards
    From Paraguay

  10. #10
    2.0Si User Hazwan's Avatar
    Join Date
    Feb 2006
    Vehicle
    86 Honda Prelude
    Location
    Malaysia
    Posts
    3,846

    Re: "FUEL" light problem

    So I've decided to drop the tank and see whats up with my FUEL light not coming on even after I've drained the tank.

    The thermistor broke into pieces ><

    Does anybody know if a regular thermistor would work as a replacement?

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  11. #11
    2.0Si User Hazwan's Avatar
    Join Date
    Feb 2006
    Vehicle
    86 Honda Prelude
    Location
    Malaysia
    Posts
    3,846

    Re: "FUEL" light problem

    Screw fixing the original sensor! I tried everything I could to replace the thermistor with stuffs that I have lying around and it still wouldn't work.

    I've decided to built another circuit to work off the float level, turning on the lamp around < 8 liters left, just like how the stock system works.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

  12. #12

    2ndGenGuy's Avatar
    Join Date
    Jan 2005
    Vehicle
    1981 Accord Hatchback, 1984 Accord Sedan
    Location
    Seattle, WA
    Posts
    9,697

    Re: "FUEL" light problem

    Quote Originally Posted by Hazwan View Post
    Screw fixing the original sensor! I tried everything I could to replace the thermistor with stuffs that I have lying around and it still wouldn't work.

    I've decided to built another circuit to work off the float level, turning on the lamp around < 8 liters left, just like how the stock system works.
    PICS and HOW TO!

  13. #13
    2.0Si User Hazwan's Avatar
    Join Date
    Feb 2006
    Vehicle
    86 Honda Prelude
    Location
    Malaysia
    Posts
    3,846

    Re: "FUEL" light problem

    No that circuit doesn't work -.-

    It won't go off even when the tank is full. Well when I had the sensor shorted so the gauge would read full haaah!

    Now back to finding another circuit that would work.

    1986 Honda Prelude build thread
    1981 Honda Accord (sold)

Similar Threads

  1. Classic "Taxi". Good ole Jim. "What does the yellow light mean?".
    By Bluntman in forum Classic Honda Community Chat
    Replies: 7
    Last Post: 06-28-2012, 12:21 PM
  2. How to turn the "dead tail light" light off...
    By charliekuney in forum 3geez Accords
    Replies: 68
    Last Post: 12-20-2009, 05:03 PM
  3. Replies: 1
    Last Post: 04-18-2009, 01:41 AM
  4. Replies: 12
    Last Post: 10-01-2002, 05:15 AM

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
This website uses cookies
We use cookies to store session information to facilitate remembering your login information, to allow you to save website preferences, to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.
     
Links monetized by VigLink