I have looked into the charcoal canister removal mod, and it appears that no one has thought the job through properly!
Much of this information can be found by scrolling down to DI 75 in the Workshop Manual PDF in link. http://www.mkivsupra.net/vbb/search.php?searchid=5339033
The Supra fuel tank and pump are designed to operate at a positive pressure of 2psi.
The fuel filler cap, is a 2psi relief valve, maintaining pressure on charcoal filter up to 2psi and gently venting excess.
Without the pressure drain gurgling through the charcoal filter, the cap has a little more relieving to do.
3 pipes on charcoal canister, listed below with direction of flow.
1 goes to induction vacuum.
1 comes from fuel tank.
1 goes to drain.
Remove vacuum pipe from inlet manifold and cap it off.
Pipe to fuel tank can be capped, or removed completely and blanked off on tank.
Drainpipe can be left open, or removed completely.
Simples !
A tidier job and minor weight reduction is made by removing pipes and blanking at source.
(An even simpler explanation is; remove it and blank off the pipes.)
ANY other plumbing arrangement is a Supra Old Wives Tale and WILL cause 'issues'.
~~~~~~~~~~~~~~~~ # # Supra Old Wives Tale :baa: #
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BUSTED