Supplies pressurized liquid LPG to the engine bay.
: A pressure regulator maintains a constant system pressure, typically 5 bar above tank pressure . This constant circulation prevents "vapor lock" or boiling of the fuel before it reaches the cylinders.
When diagnosing a faulty Vialle LPi system, always check basic engine mechanical health and the original petrol system first. If the vehicle runs perfectly on petrol but poorly on LPG, use the following matrix: Hard Starting / Engine Flooding when Hot lpi vialle technical manual top
When liquid propane is sprayed into the intake manifold, it immediately vaporizes. This phase change from liquid to gas absorbs a significant amount of heat from the surrounding air. This process drops the intake air temperature drastically, creating a denser air-fuel charge. The results mimic mild intercooling:
, and particulate matter compared to petrol or older LPG systems. Supplies pressurized liquid LPG to the engine bay
When the ignition is turned on, the LPE activates the in-tank pump at maximum speed while keeping the injectors closed. This flushes any vapor bubbles formed in the fuel lines back into the tank, replacing them with pure, sub-cooled liquid propane.
The liquid injection method inherently prevents backfire damage common in vapor systems. Environmental Impact: Notable reductions in NOxcap N cap O sub x , CO2cap C cap O sub 2 When diagnosing a faulty Vialle LPi system, always
The LPI Electronic Control Unit (ECU) operates as a slave to the vehicle’s original Engine Control Unit (OEM ECU). It reads the injector opening times commanded by the petrol ECU, blocks the petrol injectors using an internal emulation resistor network, and fires the corresponding Vialle LPG injectors with a calculated correction factor. General Pinout Architecture (Vialle LPE-7 Type)
The electrical system relies on a dedicated wiring harness that splices into the vehicle’s factory engine management system.
[Start] | v Check LED Switch on Dash ---> (Flashing rapidly?) ---> Check LPE Main Fuse & Ground | No v Listen to Tank Area upon Ignition ---> (No priming sound?) ---> Check Pump Relay & Pump Driver Voltages | Sound Present v Measure Fuel Rail Pressure ---> (Differential pressure < 3 Bar?) ---> Replace/Rebuild Tank Pump | Pressure OK v Inspect Injector Pulse via Oscilloscope ---> (No pulse?) ---> Diagnose LPE Interruption Wiring To narrow down your specific repair needs, tell me:
Vialle provides a comprehensive "Assembly Manual" which serves as the "technical manual top"—the primary source of truth for correctly working with the LPi system. In the manual's general guidelines, Vialle gives a crucial first instruction: . This process ensures all safety measures are understood before any work begins, such as disconnecting the battery to prevent electrical shorts and memory loss in vehicle systems.