fuel gauge fluctuations 406
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  1. #1
    Fellow Frogger! Phil Whitton's Avatar
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    Default fuel gauge fluctuations 406

    Im starting to find some "interesting" things with the "6". Is the fuel gauge normaly prone to rapid fluctuations like there is no baffle in the tank.?
    From 1/2 full to zero on turning left?
    any suggestions?. ( I would ask the pevious owner but he is somewhere in Qld playing with his new 407 Hdi)

    merci

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  2. #2
    jgp
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    Quote Originally Posted by Phil Whitton
    Im starting to find some "interesting" things with the "6". Is the fuel gauge normaly prone to rapid fluctuations like there is no baffle in the tank.?
    From 1/2 full to zero on turning left?
    any suggestions?. ( I would ask the pevious owner but he is somewhere in Qld playing with his new 407 Hdi)

    merci
    here-here, been living with it till now, haven't looked into yet. probably does it once a fortnight. although the 405 has never shown the same problem.
    90 405 MI16
    96 406 ST

  3. #3
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    My 405 is pretty similar. It can go from 1/2 to empty during hard cornering. A little frightening at first but as jgp says you learn to live with it.

  4. #4
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    Default Non

    Our 406 doesnt fluctuate.

    Graelin

  5. #5
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    Quote Originally Posted by Graelin
    Our 406 doesnt fluctuate.

    Graelin
    Nor mine

  6. #6
    1000+ Posts kermit's Avatar
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    Quote Originally Posted by lumpi
    Nor mine
    Nor mine.
    Cheers Simon
    >8-]

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  7. #7
    1000+ Posts Haakon's Avatar
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    Nor mine. They have a little resistor in line to stop rapid fluctuations. Mine will give a different reading after being parked on an angle, but will "average out" to the right reading after a minute or two of driving on level conditions. Maybe your resistor is shot?

    The 504 doesnt have this resistor, and a good trick when running low on fuel was to tap the brakes quickly - if the needle jumped, you had enough fuel to get home
    I tried to drown my sorrows in alcohol, but the bastards learnt how to swim

  8. #8
    1000+ Posts kermit's Avatar
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    Quote Originally Posted by Haakon
    The 504 doesnt have this resistor, and a good trick when running low on fuel was to tap the brakes quickly - if the needle jumped, you had enough fuel to get home
    Depends how far it is to home, ha ha!
    Cheers Simon
    >8-]

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  9. #9
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    Quote Originally Posted by Haakon
    The 504 doesnt have this resistor, and a good trick when running low on fuel was to tap the brakes quickly - if the needle jumped, you had enough fuel to get home
    Haha I know what you mean. Driving downhill or as you say braking would definitely make the fuel gauge read optimistically.

    The 504 fuel gauge was so inaccurate it was pretty much the only way to gauge how much you actually had in the tank.

  10. #10
    Fellow Frogger! Phil Whitton's Avatar
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    Quote Originally Posted by Haakon
    Nor mine. They have a little resistor in line to stop rapid fluctuations. Mine will give a different reading after being parked on an angle, but will "average out" to the right reading after a minute or two of driving on level conditions. Maybe your resistor is shot?

    The 504 doesnt have this resistor, and a good trick when running low on fuel was to tap the brakes quickly - if the needle jumped, you had enough fuel to get home
    Sounds like it: OK Q1 whwr does one find the fuse and whats the rating?

    merci

  11. #11
    con
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    Quote Originally Posted by Phil Whitton
    Im starting to find some "interesting" things with the "6". Is the fuel gauge normaly prone to rapid fluctuations like there is no baffle in the tank.?
    From 1/2 full to zero on turning left?
    any suggestions?. ( I would ask the pevious owner but he is somewhere in Qld playing with his new 407 Hdi)

    merci
    Phil,

    I wonder if the fuel gauge fluctuations and the electrical gremlins in my v6 have something in common??

    My speedo has started to fluctuate from 0 to 50km/h at speeds below about 30km/h: Above 50 it's ok.
    The other electrical problem (which is probably related) is that the "Stop", "Oil Pressure" and "Brake" warning lights come on at idle. So far, I have replaced the oil presure switch, oxygen sensor, the two temp sensors on the block and the air intake temp sensor, without any joy.

    I suspect that either an earthing point somewhere in the dashboard or a common connector is responsible for the electrical crosstalk.

    My next step is to find out where all the earthing points are in the v6 and clean them.


    con....

  12. #12
    Fellow Frogger! Phil Whitton's Avatar
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    OK SWMBO is starting to complain about the fluctuations so Q1: how is the best method of getting to the gauge and Q2 where would I find the resistor?




    Merci

  13. #13
    Fellow Frogger! Phil Whitton's Avatar
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    bump.

    how do we get to the circuit board?
    Phil

  14. #14
    Gus
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    Quote Originally Posted by Phil Whitton
    Is the fuel gauge normaly prone to rapid fluctuations like there is no baffle in the tank.?
    Sounds like it could be a bad ground to me, rather than a problem in the actual signal wire (although it could be a dodgy sender.) If you can find the sender (probably poking out the top of the fuel tank, if you can get to that) then check where the ground wire goes at that end. It should clip neatly onto the chassis somewhere, but maybe its come loose (I'm guessing the 406 would have a plastic fuel tank, so the ground needs to go somewhere...)

    Hth.

  15. #15
    Fellow Frogger! Phil Whitton's Avatar
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    Thanks Gus: As it came from Canberra anything possible?

    Phil

  16. #16
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    Just noticed your problem what year is yr car.

    I ahve the same problem with mine and its a 98 model (built late 97 registered Aug 98)

    The system is that the fuel pump and sender unit are a single item. the main connector for the instrument is just above your left foot, the haynes manual has a reasonable circuit of it from here you can split the circuit and check that the connebtor pins atre clean and have good tension. you can simulate the resistances ( there are links thru this web site that provide a specialist peugeot web site (http://www.peugeotlogic.com/) that provides the resistances to simulate.

    Next step is to remove the speedo assembly and chdck the connectors there give all the contacts a good clead with metho and a tooth brush. there is a little PC board on the back of the speedo assy that provides the stabilising circuit for the guage check that and see if there are any dry joints.


    The earlier models you must replace the sppedo and the fuel gauge together cost arround $800.00 -- the later models are all via data bus.

    hope this helps

    Some one on the web site also has access to copies of Peugeot manuals that you can obtain copies of that may also assist

    Cheers and good luck my problem appears to have gone away after it was all disassembeled and cleaned.
    Last edited by Meggsy; 11th December 2005 at 09:16 PM.
    Meggsy
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    And an Austin 1800
    Learnt to drive in 203 Convertible and a 403 SW

  17. #17
    Fellow Frogger! Phil Whitton's Avatar
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    Thanks: Ive just had it reregistered ( in NSW)and a secondary inspection to verify that the unit is original.Now to fix the problem.
    Merci

  18. #18
    I might be slow... DRTDVL's Avatar
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    my 306 s16 does this too.. with 1/4 a tank... i take a corner (not hard) and it will drop to empty and the light will come on...

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