The pump relies on the liquid propane itself for cooling and lubrication. Running the tank completely bone-dry repeatedly can accelerate pump bearing wear.
The Vialle LPi Technical Manual (TOP edition) serves as the definitive OEM-standard guide for one of the most sophisticated LPG conversion systems on the market. Unlike venturi (mixer) systems or standard vapor injection systems, Vialle’s LPi technology injects LPG in a liquid state.
Mounted at the return side of the fuel rail, the pressure regulator maintains a constant differential pressure over the intake manifold pressure. It ensures that the fuel pressure in the rail stays roughly 5 bar above the vapor pressure inside the tank, preventing bubble formation in the supply loop. Any excess fuel is returned back to the tank via a dedicated return line. 3. Electrical Architecture and Signal Processing lpi vialle technical manual top
Remove the saturated filter element and the old O-rings. Clean the housing interior with a lint-free cloth. Install the new element along with fresh, LPG-rated Viton O-rings coated in a light film of compatible lubricant.
: Available in 4, 6, and 8-cylinder versions, the TEC unit captures petrol injector signals via interrupt timers to calculate precise LPG injection pulses. It also manages the integrated LPG main relay. Liquid Injectors The pump relies on the liquid propane itself
: The bracket must be adjusted per specific technical diagrams before connecting the LPG lines from the manifold.
: A cabin-mounted switch that displays fuel levels via 5 LEDs (4 green for full, 1 red for low) and indicates system status through a bi-color LED (green for gas, flashing green for changeover, red for petrol). 2. Operational Logic & Advantages Unlike venturi (mixer) systems or standard vapor injection
To most, a technical manual is a dry, procedural drag. But to an LPG master tech, the is something else entirely: a cipher for one of the most elegant, finicky, and misunderstood alternative-fuel systems ever made.
A key point from a Vialle system manual is that the LPG filter in the accessory case should be replaced periodically, typically every 60,000 to 70,000 kilometers. Additionally, for optimal performance on LPG, using the correct spark plugs with a reduced gap (e.g., 0.6mm for some models) is often recommended.
Using Vialle’s diagnostic tool (or AEB / KME software for rebranded units), check these critical parameters mechanical work:
| Hazard | Action | |--------|--------| | Liquid LPG at 5–30 bar | Depressurize system via software (ECU “purge” command) before opening any liquid line. | | Electrical connections | Disconnect battery negative. LPI injectors are peak-hold (low impedance); do not apply direct battery voltage. | | Vaporizer temperature | Surface may be hot (coolant-heated). Allow to cool before handling top cover. |
