Failure to follow the manual’s explicit torque specs on the injector rail (8 Nm ±0.5 Nm) or using incorrect O-ring material (Buna-N instead of Viton) leads to micro-leaks that are undetectable by soap tests but cause progressive Lambda drift.
Diagnosing a Vialle LPi system requires understanding both hydraulic pressure and electronic signals. Probable Cause Diagnostic Action Gas bubbles in the rail / Leaking injector
Proper shielding is required for the LPi ECU wiring harness to prevent electromagnetic interference with the vehicle's stock computer.
The pump relies entirely on the liquid LPG for lubrication and cooling. Running the tank completely dry frequently damages the pump bearings. Fuel Coupling Unit (FCU)