gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Firing Order > < A/T - 4L80-E 2nd Gear only After A Cold Start/DTC 87|Page 1678
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Fuel Pressure Release: Service and Repair

PROCEDURE:

NOTE:  A constant bleed feature in the pressure regulator relieves pressure when engine is turned "OFF."

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Disconnect negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.

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Loosen fuel filler cap to relieve tank vapor pressure.

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The internal constant bleed feature of the TBI relieves fuel pump system pressure when the engine is turned "OFF." Therefore, NO further
pressure relief procedure is required.

Firing Order > < A/T - 4L80-E 2nd Gear only After A Cold Start/DTC 87|Page 1678