i fitted a 1.6 FSE valve 2 my 1.8 GTI and there was a noise coming from the fuel filter. Are the FSE valves different or is it just my filter not being able 2 handle the pressure???

 

To the best of my knowledge they're just adjustable fuel pressure regulators, which replace the standard fixed pressure items. If anything id say its more likely to be the seals in the push on connectors starting to fail (assuming it has push connectors, im sure mk5's on do)