are you talking about the hard plastic line that hooks up to the charcoal filter or one of the solenoids that go to the fuel regulator. Kinda under the impression that if it came from anything from the efi set, should be able to be plugged up and check for any kind of immediate problems, most likely wont affect the carb operation.

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87 Ranger
5.0 (306) from worn out gt mustang
Exploder 31 spline tracloc,linelockin 3:55 rear w/discs
S & R Customs in the works...

PNW Crew...