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Thread: Fuel Pump Prime

  1. #1
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    Fuel Pump Prime

    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. #2
    Phil-1's Avatar
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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.
    Audi A3 8P Sport Back 170BHP (And I Love it)

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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.

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    Quote Originally Posted by j4yvw View Post
    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.
    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. #5
    Johnny Bravo's Avatar
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    I have the same problem: Audi A3 TDI Does not start when fuel less than half a tank

    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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