Auxiliary Accelerator Pump System: Description
The Auxiliary Accelerator Pump (AAP) system increases cold engine performance by forcing more fuel into the accelerator nozzle to obtain better acceleration. The system consists of an AAP, Thermostatic Vacuum Switching Valve (TVSV) or Bi-metallic Vacuum Switching Valve (BVSV), accelerator nozzle and a gas filter.
Courtesy of Toyota Motor Sales, U.S.A., Inc.