The check valve in question (#7 in the diagram, white/ black plastic part) connects to the rubber intake tube. Each end of the tube close to the plastic intake manifold has a tiny hole where the check valve port inserts to. The other end of the check valve/ hose connects to the vacuum reservoir, not the (carbon) canister. You may have vacuum leak with the check valve disconnected, unless the intake hole is plugged.
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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