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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1168 (Engine Controls - 6.0L - Alternative Fuels (Introduction)) >> Description and Operation >> Fuel System Description >> Fuel Metering Components >> Low Pressure Lock-Off (LPL) solenoid

Low Pressure Lock-Off (LPL) solenoid

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The LPL is a normally closed, solenoid valve. The LPL is mounted in the Intermediate pressure line. The PCM controls LPL solenoid operation. The PCM energizes the LPL solenoid only when engine cranking or running is detected. Anytime the engine is stopped the PCM de-energizes the LPL solenoid in order to stop fuel flow. The PCM operates the LPL and the high pressure lock-off (HPL) solenoid at the same time except at ignition ON. During ignition ON only the HPL is opened, while the LPL remains closed, in order to charge the fuel system with CNG. The LPL is supplied fuel from the HPR with fuel pressure between 758-1,448 kPa (110-210 psi). The outlet of the LPL supplies the intermediate pressure regulator (IPR) with fuel.

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