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Fuel Pump Prime

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

  1. LCR225

    LCR225 New Member

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    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
     
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  3. Phil-1

    Phil-1 Well-Known Member
    Regional Rep

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    I have never heard my pump when opening the door. I struggle to hear it in the car when I switch it on.
     
  4. j4yvw

    j4yvw Member

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    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.
     
  5. LCR225

    LCR225 New Member

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    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.
     
  6. Johnny Bravo

    Johnny Bravo 6+1 Gears
    Bronze Supporter Audi A3

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    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
     

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