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Discussion Starter · #1 ·
I have an Impco 300 I have adapted to a 97 mountaner 5.0 throttle body. The outer ring on the impco is supposed to stay down while running propane correct?

If I understand how this thing works vacuum generated by the engine allows the diaphram to move up allowing more air and propane to pase through the TB. If thats wrong would someone please set me straight.
 
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