Rick's Free Auto Repair Advice

Posts Tagged: NVLD

Chrysler EVAP System

How the Chrysler EVAP System works The Chrysler EVAP System is different than most other EVAP systems. Here’s how it works. All vehicle manufacturers are required to build in test sequences to detect a possible leak of fuel vapors into the atmosphere. They can do this two ways: by adding pressure to the system or by pulling a vacuum on the system. Starting in 1996 Chrysler used a pressure technique using a leak detection pump (LDP) to check for system leaks. Ironically, LDP is basically a vacuum/spring driven pump. It … Read More


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