Tapped into the camshaft sensor, crankshaft sensor, or an ignition coil negative trigger to verify engine rotation.
Safely bleed the remaining pressure in the lines using a dedicated service manifold connected to the engine bay test port. Ensure the workspace is well-ventilated and free from open flames, sparks, or electronic switching equipment.
The Vialle LPi (Liquid Propane Injection) system is a 5th-generation technology that injects LPG directly into the intake manifold using a high-pressure pump to improve cylinder filling, with the LPE control unit managing injection. Key installation components include a specialized tank pump, a coupling block, and high-precision V17 injectors, detailed further in the Vialle LPi LPE-7 Assembly Manual Motor-Talk
By injecting fuel directly at the inlet valves, the system prevents the accumulation of gas in the intake manifold, which eliminates the risk of consequential damage from backfires. Vialle LPi Technical Manual lpi vialle technical manual top
Manages the transition between gasoline and LPG.
The “Top” level includes the proprietary Vialle software mapping guide. It’s not about trimming mixture. It’s about injection timing overlap with the petrol injectors. In bi-fuel mode, the system doesn’t switch—it blends during transition. The manual’s “Top” calibration chart shows how to phase LPI pulse width against gasoline pulse width to within 0.2ms for a seamless, driver-invisible handover. Get this wrong, and the customer complains of a “hiccup” at 3,500 rpm.
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Matches gasoline performance through the cooling effect of liquid injection.
1. Defective LPI Pump Relay.2. Seized or open-circuit LPI tank pump.3. No RPM signal to LPI ECU.
Use a backing wrench on the filter body to prevent twisting the high-pressure copper or thermoplastic lines. Slowly loosen the filter housing cap. The Vialle LPi (Liquid Propane Injection) system is
Below is an article-style technical overview of the Vialle LPi system, structured like a condensed technical manual to help you understand the architecture, key components, and maintenance requirements.
Power drops typical of vapor LPG systems are eliminated.
The pump elevates the fuel pressure to ensure the propane remains completely liquid, even when exposed to high under-bonnet temperatures.
While the assembly manual is essential for installation, real-world operation and maintenance often rely on practical diagnostic insights shared by technicians and experienced owners. This information is crucial for long-term system health.