The pump relies on the liquid propane itself for cooling and lubrication. Running the tank completely bone-dry repeatedly can accelerate pump bearing wear.
When tracking intermittent electrical faults or communication errors, verify the core connections at the LPE harness: Pin Connection Target Voltage / Signal Direct Battery Positive via Fuse 12.6V – 14.2V (Engine Running) Ground Chassis / Engine Block < 0.1V drop against negative terminal RPM Signal Crankshaft Sensor or Coil Pack Clean square wave / AC pulse TPS / MAP Load Reference (depending on model) 0.5V to 4.5V variable Pump Relay Out Power feed to the fuel pump 12V during prime and run cycles If you are working on a specific repair right now, tell me:
. This "technical manual" overview details the core components, operational logic, and maintenance protocols critical for system performance. 1. Core System Components
: Inject liquid LPG directly at the inlet valves, allowing for sequential or semi-sequential timing identical to the vehicle's original fuel management. Synthetic Fuel Lines lpi vialle technical manual top
The system is less affected by ambient temperatures and gas composition compared to traditional systems.
The liquid fuel travels to a dedicated fuel rail. Vialle LPi injectors deliver the liquid LPG directly into the intake manifold near the intake valves. This liquid injection creates a cooling effect in the combustion chamber, increasing volumetric efficiency. Pressure Regulator and Return Block
The LPI system requires a specially designed LPG tank with a built-in high-pressure fuel pump that pumps liquid propane to the engine. The pump relies on the liquid propane itself
Senses when the vehicle key is in the "On" position to awaken the LPI ECU.
Cover screws: 6 Nm (dry, threadlock optional) Diaphragm center nut: 3 Nm
“Forget everything you know about propane. This is liquid. It obeys different gods.” Synthetic Fuel Lines The system is less affected
Low fuel pressure detected during standard operation, forcing an automatic fallback to petrol. 3. Maintenance and Service Intervals
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.
The LPE is the auxiliary electronic control unit. It intercepts the petrol injector signals, calculates the modified injection duration required for LPG, and drives the LPi injectors. It also manages pump speed and diagnostic communication. 2. Operating Principles and Fuel Management
