Vacuum Advance
Apply vacuum to main diaphragm and sub-diaphragms (if equipped). Ensure both diaphragms move and hold vacuum. If no movement occurs, replace vacuum advance. Ensure diaphragms hold vacuum.
Apply vacuum to main diaphragm and sub-diaphragms (if equipped). Ensure both diaphragms move and hold vacuum. If no movement occurs, replace vacuum advance. Ensure diaphragms hold vacuum.