Choke Opener Diaphragm

1. Disconnect upper choke opener vacuum hose at vacuum hose manifold.
2. Disconnect lower choke opener vacuum from vacuum hose manifold and connect vacuum pump to hose, then apply vacuum.
3. If vacuum does not stabilize at 4-8 inches Hg and pull the opener rod, check linkage for signs of mechanical binding and replace left carburetor as necessary.
4. If vacuum did stabilize and pull the opener rod, cap end of upper vacuum hose and apply vacuum.
5. If opener rod is not pulled, replace left carburetor.