The Dodge Ram 3500 Canister Purge Valve captures fuel vapors and returns those gases to the engine intake to be burned rather than polluting the atmosphere. This Canister Purge Valve installed between the charcoal canister and manifold is opened by the engine vacuum when commanded by the computer, thereby pulling fresh air through activated charcoal, which sweeps the hydrocarbons inside the cylinders. The valve will modulate the flow so that your Canister Purge Valve will be running smoothly with low emissions at cruise. When a Canister Purge Valve gets clogged, the idle is disrupted. Regularly cleaning the Canister Purge Valve keeps it efficient. If it sticks or leaks, EVAP sensors see odd tank pressure, store a code, and light the dash, warning Ram 3500 owners of vapor loss or even a loose cap. The early editions of Ram 3500 made use of a simple vacuum actuated unit, but later Ram 3500 trucks gained an electronic solenoid the ECM cycles for precise leak tests. This was done so Dodge can monitor the sealed system. Because it rarely fails mechanically, many Dodge drivers clear debris or simply tighten the fuel cap on their Dodge to solve the warning.
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