DS IE Fuel Bubbles
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  1. #1
    DX5
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    Default DS IE Fuel Bubbles

    The low-flying-chevrons ('Cindy') has been rather gutless lately with hesitation and bucking under load. While investigating I noticed more gas bubbles than I'd have thought should be there in the fuel lines... As the bubbles are visible in the return line as well as the suction (right at the tank), I don't think it is entrained gas or cavitation. Anyone observed similar bubble streams in the fuel lines? The tank is about 1/4 full. Rubber joints look to be in good nick.

    I had similar running problems a couple of years ago - turned out to be a blocked fuel filter - as some lazy git (me) had never bothered to change it - since then the old thing has run strong. Until now. Could of course be electrical etc. etc. but it would be nice to know the bubbles are a common sight!

    Thanks in advance.
    Richard.

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  2. #2
    Fellow Frogger! CorneSoutAfrica's Avatar
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    Hi Richard

    Well with this I could probably help you. It is a definite no. Change your fuel lines if you haven' t yet done it. Change your fuel filter and keep your fuel tank above or on half mark. You haven' t touched your fuel line leading to the tank, have you??

    At least you have a running efi... Jealous.... Lol

    Cheers
    Corne
    1968 ID21 break
    1971 DS21 IE BVH Rouge de grenade (Madamoiselle Rouge)
    1974 DS Pallas Sable metalisse My first restoration (Edith) Now BVH
    1973 DS pallas Metallic red. "Rusty"

    1947 Traction Avant

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  3. #3
    Real cars have hydraulics DoubleChevron's Avatar
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    Don't take this the wrong way ....................... But you have tried changing the fuel filter right

    seeya,
    Shane L.
    'Cit' homepage:
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  4. #4
    Fellow Frogger! mberry's Avatar
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    Default The rubber diaphragm in the pressure sensor....

    Assuming you have checked the obvious causes for fuel starvation..... Worth checking the pressure sensor, an efi specialist could swap the unit out in order to test. I remember that the Mercedes of the same vintage all had the early Bosch efi units, ( the same ) in case you need to replace something. The rubber diaphragm in the unit loses it's elasticity with age, even though it appears to be good, which can result in the car dying under load.

  5. #5
    DX5
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    Default I did I did!

    Thanks for the replies . As previous trouble was blocked fuel filter, I put a new one on last week (it's not that and the old one was clear). The bubbles are visible right at the fuel tank suction line anyway (before the filter). The rubber joint between tank and the clearish fuel line is sound. Is there a screen in the tank? Maybe the bubble stream is acceptable and the fuel rail is capable of purging them via the pressure regulator. Maybe I'm clutching at straws but air pockets in the fuel rail would sure give plenty of misfiring...

  6. #6
    Fellow Frogger! CorneSoutAfrica's Avatar
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    The way I understand is if the fuel level in the tank is too low (below 1/4 tank) then you can get some air in the system. Now I ask you, does it still happen say at 3/4 fuel tank? I am not sure but I *think* the EFI also have the filter inside the tank but the other question is , could the plastic fuel line inside the tank have got a crack in it that runs half way up towards the feeding line rubber that covers the iron line leading into the tank? then you will certainly have these symptoms, does it get worse when it is warmer?

    Cheers
    Corne
    1968 ID21 break
    1971 DS21 IE BVH Rouge de grenade (Madamoiselle Rouge)
    1974 DS Pallas Sable metalisse My first restoration (Edith) Now BVH
    1973 DS pallas Metallic red. "Rusty"

    1947 Traction Avant

    Modern

    2006 C4 VTS 180 Coupe

    What would life be if we had no courage to attempt anything?
    - Vincent van Gogh

  7. #7
    Real cars have hydraulics DoubleChevron's Avatar
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    I seem to remember someone having this problem in the past due to the fact there fuel tank had the carby cars "stacked disc" fuel filter in it (maybe someone had swapped a carby cars fuel tank in there). Electric pumps are great at making pressure, but poor at "sucking" against any type of restriction (ie: the carby cars intank filter). Someone hasn't added the extra filter in the tank at some point have they?

    seeya,
    Shane L.
    'Cit' homepage:
    Citroen Workshop
    Proper cars--
    '85 Series II CX2500 GTi Turbo I
    '63 ID19 http://www.aussiefrogs.com/forum/showthread.php?t=90325
    '72 DS21 ie 5spd pallas (last looked at ... about 15years ago)
    '78 GS1220 pallas
    '92 Range Rover Classic ... 5spd manual.

    Yay ... No Slugomatics


    Modern Junk:
    '07 Poogoe 407 HDi 6spd manual

  8. #8
    DX5
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    Thank you for the suggestions. Will check with more fuel in the tank (looked into the tank by removing gauge sender but baffles in the way but am sure it's an original IE tank, can't think anything would have been added). Will update if/ when I find out more...

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