Question about 2001 Volkswagen Jetta TDI

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I have a vw bora 2002 petrol ... my car just dies while am driving it. and when i try to start it again it wont . but if i wait for 10 mins the car would start again but dies back again after a while. it just dies if i was driving it or if it was idle. and it doesnt matter if it was hot or cold, i thought it a was a fuel pump so i replaced it and the fuel filter as well but nothing happened !!!!

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  • bluehell3 Apr 25, 2011

    having u said that am positive its the charcoal canister. but the thing is when it starts to leak , if i disconnect the line that u said comes from the top of the tank it brings so much fuel i would guess a liter not less?!???
    so why does this line that comes from the top of the tank would bring fuel not vapor???
    and this thing started after i changed my fuel pump . could that be relevant ????

  • bluehell3 Apr 25, 2011

    by the fuel pump part i mean could he possibly connected something wrong ?? or put a tube in a wrong place???


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This looks very like either the crank sensor or cam sensor is faulty. The are OK when cold but as they warm up everything expands just that little bit and if there is a break in the wiring inside them then a gap opens up and it dies. When it cools down things contract back again the gap closes the break reconnects and it works again. If it is possible put straightened out paper clips (called 'back probing') into the back of the wires at the sockets to these devices and then use a voltmeter to detect the voltages on them. Check when cold and then every few minutes as the engine warms at idle. One of the sensors will begin to reduce voltage as it gets warm, this is the faulty one that needs changing.

Posted on Mar 22, 2011

Testimonial: "i really dont know what to say that was really helpful ... my car now works fine . thanx i appreciated :)"

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  • bluehell3 Apr 10, 2011

    thanks man for ur help . i changed the sensor and now the car works ok.
    i just have one more Q.
    my car leaks fuel from this can located between the cooling water container and the wiper's one ... its black and has filter inside it !!! if the car moving there's no problem but whenever it idles after it warms up it starts leaks fuel !!!!!

  • Joseph Prosser Apr 10, 2011

    This 'can' could be the EVAP canister. I confess I cannot visualise the position of this on the 2002 Model. When your car is sitting on a warm day the space in the fuel tank above the fuel becomes saturated with vapour. There is a tube that connects to the top of the fuel tank that runs to the front of the car to the EVAP canister. This canister contains charcoal (could this be the filter you talk of) and the fuel vapour adsorbs to it. When the car is above idle speed the ECU (engine control unit) instructs a purge valve to open to allow the fuel vapour to be drawn into a pipe that connects with the inlet manifold after the throttle plate. The partial vacuum in the manifold sucks vapours from the canister and these are then burnt during the engine combustion.
    Check that your 'can' has a tube attached to it that eventually makes connection with the inlet manifold and if so this is certainly the EVAP charcoal fuel vapour trap. Also connected the the EVAP is a vent valve. This valve allows fresh air to be drawn in to help with vapour removal when the purge valve is opened. The Purge valve is opened electrically by a solenoid. You should be able to locate this on the pipe to the inlet manifold, it's not very big and has a couple of signal wires connected to it. If the purge valve and possibly the vent valve fail to open then there is the possibility that the charcoal becomes saturated with fuel vapour. In any event the canister should be air tight and not leak. Remove the purge valve and youvshould find that it should resist when you try to blow through it. Apply 5 volts to it ( sometimes12 volts) and the valve should click open and allow you to blow through it. Sometimes the valve can get stuck with charcoal dust and if you are careful it might be possible to disassemble it and clean it up. You may wish to consider changing both the canister (since it leaks) and the purge valve. I hope that gives you little insight, good luck

  • Joseph Prosser Apr 26, 2011

    OK take your time here and really understand the anatomy of your car. Fuel: there is a line from the tank that enters the fuel pump and then fuel filer. This line becomes the fuel rail to which the fuel injectors are attached. At the end of the fuel rail is the circular fuel pressure regulator (also with a narrow diameter vacuum line). After the regulator the line goes back to the petrol tank to return excess fuel. The fuel tank is served by three pipes. Two are metal, the 'fuel supply' and 'return' from the engine. The third is rubber and this is the EVAP line to the charcoal canister. The EVAP canister should not fill up with fuel. It is merely a passive absorber of fuel vapour that evaporates from the surface of the fuel in the tank. The purge valve opens to allow air to be drawn in (via the passive vent valve) through the canister to allow the fuel vapor to be released and burnt in the engine.
    Follow every pipe from the tank and identify where they go and correctly identify all the components and the order in which they are encountered. Make sure that no pipes are incorrectly attached to anything. The fact that your canister liberated so much fuel is worrying. Do you ever over-fill your fuel tank? there might be a possibility that when the tank is over filled that fuel instead of just vapor may enter the EVAP line. If this happens then empty the canister and allow to dry out. Re-connect and drive the car as per normal. If everything is normal (purge valve opens etc) the canister will be OK.


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Hi. I agree with the cranks angle sensor. sounds like atext book example of the fault it causes. The cam sensor will cause hard starting on this engine, not cutting out. Replace the g28 angle sensor.

Posted on May 07, 2014

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