RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
on intake manifold vacuum.
Fig. 13 Engine OFF Or Engine Backfire - No Vapor Flow
When the engine is not operating or during an engine pop-back, the spring forces the plunger back against the seat. This will prevent vapors from
flowing through the valve.
Fig. 14 High Intake Manifold Vacuum - Minimal Vapor Flow
During periods of high manifold vacuum, such as idle or cruising speeds, vacuum is sufficient to completely compress spring. It will then pull the
plunger to the top of the valve. In this position there is minimal vapor flow through the valve.
Fig. 15 Moderate Intake Manifold Vacuum - Maximum Vapor Flow
During periods of moderate manifold vacuum, the plunger is only pulled part way back from inlet. This results in maximum vapor flow through the
valve.
