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Thread: Sucking in air

  1. #1
    Join Date
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    Sucking in air

    Mk1 pickup 16d,
    I have just recently started having trouble starting my truck, after having a look it is sucking in air from the top of the fuel pump return, tried tightening all the jubilee clips and tightened everything connected with the pump, the injector pipes are fine and it is still sucking in air.
    any ideas
    Cheers dawn
    Last edited by dawn64; 12-03-2018 at 06:57 PM.

  2. #2
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    Ok I'll look at it for you
    Do not know why
    I,v suffered enough I married you LOL

  3. #3
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    Might not be the cause but I once repaired a mini digger and struggled getting it to start as it was sucking air. Eventually I found out I’d over tightened one of the jubilee clips

  4. #4
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    Having the same prob with my T4.
    There was a slight leak from the fuel lines. Fitted new ones, won’t start. Turns out it’s the seal around the fuel pump. Needs to be removed, posted away, repaired, sent back, refitted.
    Fuck I hate living on this island!

  5. #5
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    What seal on the pump, as I have a spare pump for spares, we have changed all the pipework and checked all the fittings.

  6. #6
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    Dunno. My engineer mate could tell you if I wasn’t in Inverness.

  7. #7
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    Do you mean you can see bubbles in the return?
    Most of the pump external pump seals would show a fault by leaking. Front seal can suck air. Injector return pipes can be come porous and are cheap and easy to change.
    Air can enter the pump and hence the return via the feed system anywhere from tank to pump.
    Fill a bottle with fuel and attach to inlet feed union, see if it runs.

  8. #8
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    We have changed all the pipes, there is no leaking diesel at the pump, and still sucking in air

  9. #9
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    Tried it running from a can and pipe sat under the bonnet?
    How do you know it's sucking air?

  10. #10
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    Leak down pipes - replace them all for a few quid with 3mm petrol hose, replace the blanking cap on no 1 injector as well.

    The filter white fitting can crack as well - check that.

    Front seals rarely go on bosch pumps.

    Pumps will pull air without leaking any diesel - they leak diesel when the throttle shaft or pump head seals go (but don't suck air)

  11. #11
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    I got your msg Reggy.

    Mine originally started with a leaky fuel pipe - the one under the van. It left a small stain everywhere it was parked for a while. Had some new lines fitted and that’s when it started to fcuk up which, I believe, is a broken seal in the pump.

  12. #12
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    Quote Originally Posted by rolo View Post
    Tried it running from a can and pipe sat under the bonnet?
    How do you know it's sucking air?
    No I have not tried the can and pipe set up.
    I have got clear pipe on and you can see the air bubbles coming from the pump return pipe

  13. #13
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    Quote Originally Posted by regcheeseman View Post
    Leak down pipes - replace them all for a few quid with 3mm petrol hose, replace the blanking cap on no 1 injector as well.

    The filter white fitting can crack as well - check that.

    Front seals rarely go on bosch pumps.

    Pumps will pull air without leaking any diesel - they leak diesel when the throttle shaft or pump head seals go (but don't suck air)
    I have got a skoda filter on and it only has an in and an out

  14. #14
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    Sorted it, we renewed the injector return pipes and no more bubbles.

  15. #15
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    Quote Originally Posted by dawn64 View Post
    the injector pipes are fine
    Quote Originally Posted by sandancer View Post
    we have changed all the pipework and checked all the fittings.
    Quote Originally Posted by sandancer View Post
    We have changed all the pipes, there is no leaking diesel at the pump, and still sucking in air


    Quote Originally Posted by rolo and regcheeseman
    change the leakdown/return pipes
    Quote Originally Posted by sandancer View Post
    Sorted it, we renewed the injector return pipes and no more bubbles.

  16. #16
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    Personal theory...Fuel gets hot....cools down overnight.... the tank then has lower pressure than the outside as its partly sealed. The air then gets in through the weakest point.
    The leak off pipes.
    seen a few bad start issues cured by changing the leak off pipes, I have 7mm round spring clips on mine with the thought that it cant hurt

  17. #17
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    Reg, we have just moved and I am working my way through all the car part boxes, I found some and put them on but they obviously were not new, so went and got some new ones and now it is all sorted.
    My fault for being a tight twat LOL
    By the way it is her truck and I don't want to spend money on it LOL

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