There should be three hoses connected to coast-enricher.
How much petcock flows is important. Just having power at battery is different with 8v vs. 12v.
How much does petcock flow in 30-sec with barely any vacuum applied?
Bikes aren't binary, they're analogue with shades-of-grey variations. Depending upon which end of grey you're at, they may or may not work at all.
Also have you check internal fuel-hose filter? Is it inserted in correct direction or has it been crumpled and wadded up into ball?
