All evap systems need a way to seperate any liquid fuel that might splash
into the vapor system. Having not seen the TR6 system, I suspect the tubes you
are talking about are part of a maze to prevent liquid from hitting the carbon
canister.
In theory, if you dump the evap system the car will run ever so slightly lean
( more so just after a cold start ) because the vapors are not being drawn
into the intake.
In practice, if you plug the vacuum line to the intake to prevent a large
leak, the motor really won't know the difference. You will however need to
vent
the tank and deal with fuel vapors coming from the tank. ( a small garage
can smell like gas in a short time.)
Harold
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