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GMC
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1991
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Forward Control 7.4 N
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Basic Testing
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A-7, Basic Fuel System Checks (Gasoline)
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Fuel System Pressure Relief
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Model 220 TBI Unit (Except 2.5L)
Model 220 TBI Unit (Except 2.5L)
WARNING:
Fuel pressure is relieved and drops to zero when ignition is turned off. To minimize risk of fire and personal injury, cover area to be disconnected with a shop rag.