Results 1 to 6 of 6

Thread: Fuel Gauge issue....did a search

  1. 03-20-2020, 11:49 AM #1
    beetle08
    beetle08 is offline
    Senior Member beetle08's Avatar
    Join Date
    Oct 2010
    Location
    Seattle, WA
    Posts
    535

    Fuel Gauge issue....did a search

    Howdy,

    So i have a 68 911 with a 100L Specialty Cars sending unit. Rebuilt gauge, new sending unit, new wiring harness, new tank.

    Plug everything in and the gauge immediately hits 4/4 regardless of fuel level. I checked the ground to the gauge; all good. Thought it was the gauge, connected another gauge, same result. I connected the regular sending unit to test, same result. Ran a separate ground from the tank to the body (bare metal restoration so checked to see if sufficient ground)....same result.

    I did a search and couldst find the same scenario. Any advise is greatly appreciated. Help!

    Thanks,
    Mauricio
    Three Pedal Posse
    Member # 1935

    1968 Porsche 912-6 TR Tribute
    1968 Porsche 911 L
    1973 VW Sportsbug
    1974 Porsche 911 S
    1991 Porsche 964 Carrera 2 3.8

    "if you see a fork in the road, PICK IT UP!"
    Reply With Quote Reply With Quote
  2. 03-20-2020, 04:53 PM #2
    ejboyd5
    ejboyd5 is offline
    Senior Member ejboyd5's Avatar
    Join Date
    Dec 2010
    Location
    Southold, NY
    Posts
    821
    If another gauge and another sending unit result in the same 4/4 reading, it would seem to indicate a problem in the connections between the sender and the gauge. Try running temporary wires between the sending unit and the gauge in place of the wires contained in the harness. Report your results and we'll help you determine which one of the original wires is at fault.
    Reply With Quote Reply With Quote
  3. 03-21-2020, 08:38 AM #3
    beetle08
    beetle08 is offline
    Senior Member beetle08's Avatar
    Join Date
    Oct 2010
    Location
    Seattle, WA
    Posts
    535
    Thank you! I'll give it a try.

    M
    Mauricio
    Three Pedal Posse
    Member # 1935

    1968 Porsche 912-6 TR Tribute
    1968 Porsche 911 L
    1973 VW Sportsbug
    1974 Porsche 911 S
    1991 Porsche 964 Carrera 2 3.8

    "if you see a fork in the road, PICK IT UP!"
    Reply With Quote Reply With Quote
  4. 03-21-2020, 12:52 PM #4
    beetle08
    beetle08 is offline
    Senior Member beetle08's Avatar
    Join Date
    Oct 2010
    Location
    Seattle, WA
    Posts
    535
    One more detail; when I flip the sending unit over ; the empty light does come on however, the gauge still jumps to 4/4 when the ignition is on
    Mauricio
    Three Pedal Posse
    Member # 1935

    1968 Porsche 912-6 TR Tribute
    1968 Porsche 911 L
    1973 VW Sportsbug
    1974 Porsche 911 S
    1991 Porsche 964 Carrera 2 3.8

    "if you see a fork in the road, PICK IT UP!"
    Reply With Quote Reply With Quote
  5. 03-21-2020, 12:57 PM #5
    71gold
    71gold is offline
    Senior Member
    Join Date
    Aug 2015
    Posts
    1,752
    If you connect your meter to the sending unit and slowly move it up-down and put meter on ohms you should see the change in resistance ..
    Which tells you the sending unit is working properly. If that’s good then it’s the wires in between or at the gauge wire setup.
    73.5 Snrf T
    71 Snrf T
    70S targa
    76 914 2.0
    82 Targa,
    85 Alfa GTV6
    60 Lancia Appia Zagato GTE
    Searching for transmission 7115322 (911/01)
    Reply With Quote Reply With Quote
  6. 03-21-2020, 02:27 PM #6
    beetle08
    beetle08 is offline
    Senior Member beetle08's Avatar
    Join Date
    Oct 2010
    Location
    Seattle, WA
    Posts
    535
    Fixed! Had a pinched wire. Thank you gents!
    Mauricio
    Three Pedal Posse
    Member # 1935

    1968 Porsche 912-6 TR Tribute
    1968 Porsche 911 L
    1973 VW Sportsbug
    1974 Porsche 911 S
    1991 Porsche 964 Carrera 2 3.8

    "if you see a fork in the road, PICK IT UP!"
    Reply With Quote Reply With Quote
« Previous Thread | Next Thread »

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  

Forum Rules


Message Board Disclaimer and Terms of Use
This is a public forum. Messages posted here can be viewed by the public. The Early 911S Registry is not responsible for messages posted in its online forums, and any message will express the views of the author and not the Early 911S Registry. Use of online forums shall constitute the agreement of the user not to post anything of religious or political content, false and defamatory, inaccurate, abusive, vulgar, hateful, harassing, obscene, profane, sexually oriented, threatening, invasive of a person's privacy, or otherwise to violate the law and the further agreement of the user to be solely responsible for and hold the Early 911S Registry harmless in the event of any claim based on their message. Any viewer who finds a message objectionable should contact us immediately by email. The Early 911S Registry has the ability to remove objectionable messages and we will make every effort to do so, within a reasonable time frame, if we determine that removal is necessary.