Check Valve: Van

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Remove check valve. Mark ports for reinstallation. Blow air into fuel tank port. Check that valve opens with slight resistance. Blow air into canister port. Check that air flows through valve without resistance. If not, replace valve.

CAUTION: Do not inhale fuel vapors when blowing into valve.

Fig 1: Fuel Evaporation System (Pickup & 4Runner - Fuel Injected)