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Thread: Yet another problem with the s3

  1. #1
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    Yet another problem with the s3

    Tonight I replaced the the small vacuum hose that had spilt and the the inlet pcv breather pipe.I took the car a rather spirited drive and it seems a bit more responsive on acceleration.on the way home I pulled in to the petrol station for some fuel I open the filler cap and lots of pressurised air and petrol came gushing out can any one tell me or give me a clue to what's causing this ? Also if I remove the oil cap air gushes out as well
    Last edited by Goubo1; 14th January 2012 at 03:29.

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    Also when the car is switched off I can open the filler cap and release the pressure with little to no fuel coming out but if I leave the cap of and start the engine fuel gushes out.

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    Alex C's Avatar
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    i would guess that if air rushes out when you take the oil cap off then its not breathing properly, have you checked for blockages in the PVC system?

    not sure how or if that would affect your fuel system though
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

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    Quote Originally Posted by Alex C View Post
    i would guess that if air rushes out when you take the oil cap off then its not breathing properly, have you checked for blockages in the PVC system?

    not sure how or if that would affect your fuel system though
    Am I right in thinking that if it was not breathing properly it would not be running very? As its running better than it was before I replaced the the hoses

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    s3dave's Avatar
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    I would check the pipes around the charcoal canister next to the screen washer bottle..

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    Quote Originally Posted by s3dave View Post
    I would check the pipes around the charcoal canister next to the screen washer bottle..
    For blockages or being disconnected dave ?

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    I think it is suppose to vent there so maybe blocked?

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    Quote Originally Posted by s3dave View Post
    I think it is suppose to vent there so maybe blocked?
    There was on plastic hose that had split but got replaces with a silicone hose and made no difference.my charcoal canister is making a rather loud clicking noise,do you happen to know what hose is the vent hose dave ?

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    <tuffty/>'s Avatar
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    Sounds like what ever you have done to repair the pipes you have either missed off a check valve somewhere or piped it up wrong... would appear both your engine and fuel tank is seeing boost pressure

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    s3dave's Avatar
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    Quote Originally Posted by Goubo1 View Post
    There was on plastic hose that had split but got replaces with a silicone hose and made no difference.my charcoal canister is making a rather loud clicking noise,do you happen to know what hose is the vent hose dave ?
    It goes to the bottom of the canister and out through the wing

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    Quote Originally Posted by <tuffty/> View Post
    Sounds like what ever you have done to repair the pipes you have either missed off a check valve somewhere or piped it up wrong... would appear both your engine and fuel tank is seeing boost pressure

    <tuffty/>
    It was just the 2 braided hoses that lead under the manifold that got replaced dv to n249 hose and the plastic pipe I found yesterday from the charcoal canister.they got replaced like for like 1 at a time so I could not get them mixed up

    I opened up the filler tank and started up the engine and it gushed out on idle does this rule out the possibility of it being boost related as I was not on boost when this occurred ??

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    Quote Originally Posted by s3dave View Post
    It goes to the bottom of the canister and out through the wing
    Cheers dave I will check that out

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    <tuffty/>'s Avatar
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    There are a couple of one way valves in use with the charcoal canister... one vac pipe comes from the top of the throttle body and the other from the TIP...

    Check the pipe work on these... if the tank is seeing boost then its more likely to be the one on the throttle body... there should be a one way valve on the pipe just before it goes into the hard pipe that runs across the back of the engine bay...

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

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    Quote Originally Posted by <tuffty/> View Post
    There are a couple of one way valves in use with the charcoal canister... one vac pipe comes from the top of the throttle body and the other from the TIP...

    Check the pipe work on these... if the tank is seeing boost then its more likely to be the one on the throttle body... there should be a one way valve on the pipe just before it goes into the hard pipe that runs across the back of the engine bay...

    <tuffty/>
    Tuffty would it be possible for you to show me this pipe on a picture if you could ?

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    Well the problem turned out to be a blocked breather

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    Alex C's Avatar
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    Quote Originally Posted by Alex C View Post
    have you checked for blockages in the PVC system?
    Quote Originally Posted by Goubo1 View Post
    Well the problem turned out to be a blocked breather
    woop woop
    Goubo1 likes this.
    Alex S3 AMK
    Bilstein B8s, H&R Springs, Neuspeed ARBs, Genuine 18" BBS LMs & LCR Brembos

 

 

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