ATC Vacuum and Fuel Pump Tester Complete Fuel Pump & Vacuum Gauge Tester. Test Fuel Pressure On Mechanical & Electric Fuel Pumps Complete Fuel Pump & Vacuum Gauge Tester. Test Fuel Pressure On Mechanical & Electric Fuel Pumps Also Diagnose Improper Timing, Burned Or Stuck Valves, Leaking Manifold, Improper Fuel Mixture, Sticking Choke Large 3-1/2" Diameter Gauge With Color Coded Easy Reading Scale Test Pressure Up To 10 PSI / Test Vacuum Up To 28" HG Extra Long Heavy Duty Rubber Hose & 14mm/17mm Manifold Adapter