Yes, the carb has those I believe whistle vents they're called? Also, being my engine/trans sits in the van at a pronounced angle vs sitting close to level like in most vehicles means the fuel may be "level" but it will be higher against the primary metering block and lower against the front of the bowl, as well as higher on the secondary rear bowl, possibly with that vent submerged in fuel......hmmm. And hmmm again
