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A pressure increase of less than 2 bar points directly to a worn or failing PTC pump. 4. Maintenance and Repair Protocols

Maintains the required differential pressure across the injector rail.

Located in the engine bay, this component regulates the pressure differential between the fuel rail and the tank. It ensures that a consistent flow of liquid LPG is always available at the injectors and routes excess fuel back to the tank via a return line. The LTC (LPG Treatment Unit) / Coupe Unit

Do not confuse a Vialle LPI manual with a Vialle vaporizer manual (used for older gaseous injection systems). The components are not interchangeable. lpi+vialle+technical+manual

For the modern technician, a Vialle technical manual is more than a repair guide; it is a textbook on thermodynamics. It teaches how to manage state changes (liquid to gas) inside an engine and how to synchronize two fuel systems to run seamlessly.

Unlike vapor systems that rely on tank pressure, the Vialle LPi system utilizes a high-pressure liquid pump immersed directly inside the LPG tank. This pump pressurizes the liquid fuel line up to 5 bar above tank pressure to prevent the LPG from boiling or vaporizing before it reaches the injectors. The LPi Fuel Injectors

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⚠️ Liquid propane boils at -42°C (-43.6°F) at atmospheric pressure. If liquid LPG contacts your skin during a component swap (such as removing an injector or disconnecting a fuel line), it causes instant, severe frostbite .

Periodically checking for "heavy ends" (oily residue) in the lines that can clog injectors.

Lubricate the new pump's O-rings with LPG-compatible silicone grease before sliding the assembly back into place. Torque the lock ring bolts in a cross pattern to factory specifications. Servicing the LPI Injectors Located in the engine bay, this component regulates

The manual details three distinct operating phases managed autonomously by the LPE ECU:

Vialle LPi injectors are high-precision, electromagnetic valves designed to handle cryogenic liquids. They inject liquid LPG at temperatures well below freezing directly into the intake ports, right next to the original gasoline injectors. The LPI Management Unit (Coupler / ECU)

The LPE masterminds the system by intercepting the vehicle’s original gasoline injection signals.

Connect a high-pressure gauge to the service valve on the fuel rail. If the pressure does not rise by approximately 5 bar when the system switches to LPG, the in-tank pump or its electronic driver module is likely failing.