Vacuum Line Question

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BroBob1

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Jun 14, 2009
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Anyone know what the vacuum line on the #1 Carb is for?
#2,3, and #4 carbs have the plugs on them and theses are the spots that you hook up your vacuum gauges.
I want to know if the #1 vacuum line is needed because I want to inject a hydrogen, oxygen mixture into these ports.
Thanks!
 
It's for the pressure sensor which provides supplemental ignition advance depending on intake pressure/vacuum.
 
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