If you sick on the pipe there should be some pressure resistance and the actuator should move, if you suck on the pipe & it's like sucking on a straw your diaphragm is split.
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Few possible causes. 1) You're running really cr*p fuel, 2) You're running the fuel too low and sucking up all the crud in your tank, 3) Tandem pump is leaking oil into the fuel line, 4) Injector seals are stuffed and that's all the carbon soot making its way into the fuel return.
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A3 don't tend to suffer with subframe knock, and apart from the washer in that kit, it uses a standard Audi bolt - which is the upgrade the VW guys do to cure the problem. Save yourself some cash & just buy the bolts you need from the Audi dealer, they're cheap enough.