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Fuel Pump Prime

Discussion in 'A3/S3/Sportback (8P Chassis)' started by LCR225, Jun 23, 2014.

  1. LCR225
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    LCR225 New Member

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    [Jun 23, 2014]
    Hello,

    Can someone with a 2.0 TDi 170 confirm whether they hear the pump prime when opening the drivers door? Or should it only do it when ignition is on?

    Cheers
    #1
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  3. Phil-1
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    Phil-1 Well-Known Member

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    [Jun 23, 2014]
    I have never heard my pump when opening the door. I struggle to hear it in the car when I switch it on.
    #2
  4. j4yvw
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    j4yvw New Member

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    [Jun 23, 2014]
    hi mine is the same it only primes when you switch it on. The issue i have is if i don't use the car for a few days it will not start straight away, it takes a coulple of cranks to fire up.
    So what i do now is to prime it a few times and it fires on the first crank.
    #3
  5. LCR225
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    LCR225 New Member

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    [Jun 23, 2014]
    Thats the very same issue I have. Trying to get to the bottom of it as it's getting worse to start from the first cold start of the day. As in takes around 8 goes before it starts.

    Noticed its more when the car has half a tank or less of derv left.
    #4
  6. Johnny Bravo
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    Johnny Bravo 6+1 Gears

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    [Jun 24, 2014]
    I have the same problem: http://www.audi-sport.net/vb/a3-s3-...hen-fuel-less-than-half-tank.html#post2172753

    I've recently got a used in-tank pump from a friend, for testing and the starting problem has gone.
    I'm going to buy a new pump.

    The problem is that there is a one-way valve on the circuit that should prevent the fuel to drain back in the tank. This valve is failing and can't keep the system pressurised.

    A lot of details here: 2005 BEW PD lift pump operation and internals - TDIClub Forums
    #5

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