Operation CHARM
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GMC Truck
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1999
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S15/T15 Sonoma P/U 4WD V6-4.3L VIN X
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Repair and Diagnosis
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Powertrain Management
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Fuel Delivery and Air Induction
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Description and Operation
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Fuel Supply Component Description
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Fuel Pipe O-Rings
Fuel Pipe O-Rings
The fuel feed and return pipe threaded connections at the fuel injection unit are sealed with replaceable O-ring seals. These O-ring seals are made of special material and should only be serviced with the correct service pant.