Anti-siphon Valve
I just replaced a Sierra filter with a Racor filter and vacuum gage on my '76 Seafari with an ETEC 150. On the first run I was at the BRP recommended limit of 4 in Hg. Bushwacker advised to look for an anti-siphon valve and remove it per ETEC ownersgroup recommendations to avoid running too lean & hot. Removed it and partially blocked screen on fuel tank vent. Have not rerun it yet, but fuel bulb is harder.
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