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Dump Valve

With engine at normal operating temperature, remove dump valve vacuum hose from manifold and plug manifold connection.
Raise engine speed to 2000 RPM. Vacuum should be present at exhaust ports on bottom of valve. If not, replace valve.
Reconnect vacuum hose to manifold and raise engine speed to 2000 RPM. No vacuum should be felt at exhaust ports on bottom of valve. If vacuum is present, replace valve.