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  1. #1
    Reverse Gear

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    Jul 2008
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    8P S3 Anyone had problems with the fuel relief valve on the fuel rail?

    been having problems with the car, fuel pressure jumping from good 120+ pressure to as low as 7 bar at the rail.

    i was told a fuel relief valve on the fuel rail maybe at fault. i bought part from audi at 19+vat. its a threaded piece that goes in below the inlet manifold and accepts fuel line. I havnt changed it yet as it looks in an awkward place!

    anyone had to change one of these before?

    I looked to change the sensor/valve on top of the fuel pump (32mm spanner fixing), but they said this comes complete with a fuel pump only?

    current fault code reads Low fuel pressure.

    Help, im missing the car big time!

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  3. #2
    Mpathe's Avatar
    1st gear

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    Aug 2009
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    wrong section pal, but dont think your car is supposed to run anywhere near 7 bar of fuel pressure, 8l s3 runs std 3 bar reg
    09 white black edition a3 2.0 tdi 😃
    99 silver apy s3 - revo stage 2 mapped - relentless downpipe + sports cat - cat back milltek - fmic - piper x panel filter - silicone tip - forge 007 - vmaxx coilys - andy mac stealth sub - wilwood 4pots and r32 discs - h &r spacers - bbs ch wheels or std gunmetal grey alloys

  4. #3
    Reverse Gear

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    ah ********. this is the old shape s3 isnt it? can someone move it into the new type s3 for me?

    pressure at the rail on a tfsi s3 should be 100+, hence that cam driven hpfp.

 

 

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