| 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. |
The system switches back to petrol unexpectedly; diagnostic trouble codes (DTCs) for low pressure. Technical Diagnosis:
The manual emphasizes critical installation discipline:
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If you are looking for "Top" technical problems or maintenance procedures, these are the most critical areas: lpi vialle technical manual top
: No loss of engine power because the "cooling effect" of liquid-to-gas phase change densifies the intake air, often improving efficiency. Environmental Impact
Wear heavy-duty cryogenic gloves and protective eyewear. Liquid propane expands rapidly and can instantly freeze exposed skin upon contact.
Denser air means more oxygen enters the combustion chamber.
Detailed diagrams and full service procedures can be found in the following authoritative documents: | Hazard | Action | |--------|--------| | Liquid
When diagnosing a fault within the top-tier components of the LPi system, follow this systematic diagnostic hierarchy: Hard Starting (Engine Cranks Long Before Firing)
Connected directly to a clean, unpainted chassis ground or the negative battery terminal.
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.
Symptom: Engine runs on petrol, not switching to LPG → Check LPG tank level (>15% required) → Check LPG pressure (if 0 bar → pump or fuse) → Check vaporizer temp (if <30°C → coolant flow or air in system) | | Vaporizer temperature | Surface may be
Slowly open the tank service valve. Prior to starting the engine, spray all disturbed joints with a certified gas leak detection spray (bubble solution). Watch closely for any foaming. Fix any leaks immediately before restoring electrical power. 6. Technical Specifications and Wiring References Pinout Configuration Matrix (Typical Vialle LPE-7 Type ECU) Pin Number Wire Color Signal Function Target Destination / Connection Type Pin 1 Red / Black Main Battery Power (+12V) Vehicle Battery positive via 15A inline fuse Pin 2 System Ground (0V) Chassis grounding point / Engine block Pin 5 Switch Communication Dashboard fuel selector switch module Pin 12 RPM Signal Camshaft/Crankshaft sensor or ignition coil negative Pin 18 Injector 1 Intercept Input Signal coming out from petrol ECU for cylinder 1 Pin 19 Grey / Black Injector 1 Drive Output Output connection directly to LPG injector 1 Pin 28 Tank Pump Power Supply Outputs variable PWM voltage to tank pump relay General System Specifications Operating Voltage: 10V DC to 16V DC Maximum Current Consumption (Pump Active): 12 Amps
Many Vialle pumps utilize a specific internal lubricating oil reservoir. If rebuilding, replace the internal seals, clean the magnetic debris collectors, and refill with the factory-specified synthetic oil. Injector Cleaning and Calibration
Vialle LPi System Overview and Benefits | PDF | Fuel Injection - Scribd