gmc Workshop Repair Guides

GMC Workshop Service and Repair Manuals

Relays and Modules - Ignition System > < C013 Lock-Off Relay|Page 433
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Pressure Pump Relay: Description and Operation

LOW PRESSURE LOCK-OFF (LPL)

The electric low pressure lock-off solenoid provides fuel shut-off prior to the low pressure regulator. The normally closed solenoid has a high
temperature coil and is both UL and CGA approved. The LPL has a 1/4 in. diameter fuel orifice. The LPL is only commanded ON when engine cranking
or running is detected.

Relays and Modules - Ignition System > < C013 Lock-Off Relay|Page 433