There is no such diagram available. You will simply have to follow the fuel lines from the fuel rail on the engine along the truck frame rail towards the tank, or from the fuel tank along the truck frame rail towards the fuel rail on the engine. Some are on the left side frame rail and some are on the right side frame rail, depending on which engine your vehicle is equipped with. You simply have to LOOK.
This indicates a fuel vapor leak in the EVAP control system. It means a very small leak has been detected. In fact, the leak can be from a hole as small as 0.04" in diameter. The (EVAP) emission control system prevents the escape of fuel vapors from a vehicle's fuel system. Fuel vapors are routed by hoses to a charcoal canister for storage. Later, when the engine is running a purge control valve opens allowing intake vacuum to siphon the fuel vapors into the engine.
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