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Home >> Isuzu >> 1983 >> Impulse Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Evaporation System >> Operation >> With Engine Running

With Engine Running

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When vacuum develops in fuel tank or crankcase and the difference between relief side and fuel tank or crankcase is .2-.6 in. Hg, the relief valve opens and allows air from air filter to enter fuel tank or crankcase. This air replaces fuel vapors and brings fuel tank or crankcase back to balanced atmospheric pressure.

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