Dakota 4WD V8-4.7L Flex Fuel (2008)
Leak Detection Pump: Description and Operation
OPERATION
SYSTEM
The ESIM (Evaporative System Integrity Monitor) is very similar to the NVLD. However, the design of the ESIM has been simplified and unlike the
NVLD the ESIM does not require a solenoid. The ESIM mounts directly to the canister, eliminating the need for a mounting bracket. It is critical that the
ESIM is mounted vertically. On vehicles where the canister is mounted on an angle, the ESIM requires an adaptor to maintain a vertical position. When
the ESIM is installed vertically, the electrical connector is in the 3 o'clock position.
EXPLODED VIEW
The ESIM assembly consists of a housing, a small weight and a large weight that serve as check valves, a diaphragm, a switch and a cover. There is one
large weight and one small weight check valve in the ESIM assembly. A seal is attached at the end of each weighted check valve. The large weight check
valve seals for pressure. The small weight check valve seals for vacuum. The weighted check valves are contained within the ESIM housing.
