I'll give the fuel line swap a try try since I just topped it up yesterday. As for the vent I'v not noticed and suction on the fuel cap on fill ups.

We'll see what's next.

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Mad_Matt's Current Stable:
Oil Burners:
09 Jetta TDI The highway queen @ 105k
83 300D. Sold
Gassers:
16 A4 sport line
10 Passat
83 Recaro Trans AM WS6 Bone Stock Survivor
11 Harley Ultra