i have suspektet that litle boks to be a vacum pump povered by the ?-hose, but when i blowed air in the tank hose, gasoline came out the hose that goes to the carb. and when i sucked the ?-hose nothing hapend, it seemd to be clogged, but when i blowed i the same hose, gasoline ran out of both the tank hose and the carb hose
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