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Home >> GMC >> 1991 >> Value Van 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - System/Component Tests) >> Emission Systems & Sub-Systems (Gasoline) >> Fuel Evaporation Control (C-3) >> Fuel Tank Pressure Control Valve (C, G, K & M Series-High-Altitude)

Fuel Tank Pressure Control Valve (C, G, K & M Series-High-Altitude)

WARNING: This page does not describe the selected car, but rather 35 other vehicles, including the 1992 Pontiac Trans Sport, 1992 Oldsmobile Silhouette, 1992 Oldsmobile Bravada, 1992 GMC Yukon, and 1992 GMC Vandura Special. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect a hand-held vacuum pump to "control vac" port of tank pressure control valve. Apply approximately 15 in Hg. to "control vac" port.
  2. Attach a short piece of hose to fuel tank side of valve. Blow through hose. Air must pass through fuel tank pressure control valve. If air does not pass through fuel tank pressure control valve, replace defective valve.
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