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you are forgetting about the 02 sensor
no matter what
the ECM is going to use input from the 02 sensor s to keep the mixture at
14.7 to 1 or stoich
there is not going to be any gain in FE
the 02 sensor will report a slight change in the mixture
and
the ECM will adjust using first Short term fuel trim
then long term fuel trim
end result
under the same conditions -
fuel added through the vacuum lines plus fuel from the fuel tank
will add up to the exact same amount of fuel used prior to the
"modification"
there simply is not another possibility .
this is blarney proposed by someone who does not know how the system works .
case closed .
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