Installation guidelines for Auto lpg systems

Installation guidelines for the gaseous phase LPG (υγραεριοκίνηση) sequential injection system by Stefanelli Group Italy.

• Cars that can be converted

1. Fuel-injection cars with naturally-aspirated (N/A) petrol engines
2. Fuel-injection cars with turbo petrol engines

• Cars that cannot be converted

1. Cars with diesel engines
2. Carburattor cars with petrol engines
3. Mechanical-injection cars with petrol engines
4. Direct-injection cars with petrol engines

About the SIS Plus system

1. The system is suitable for all Fuel-Injection cars with 3/4 cylinder N/A petrol engines.

SIS System

1. The system is suitable for all Fuel-Injection cars with 3/4/5/6/8 cylinder N/A petrol engines.
2. The system is suitable for all Fuel-Injection cars with turbo petrol engines (4/5/6/8 cylinders)

1. SYSTEM DESCRIPTION

REAR-END

Tank - Multivalve - Filler

FRONT-END

Reducer - Filter - Electro-Injectors - ECU - Wiring - Changeover switch - Buzzer

OTHER

Piping Accessories

SYSTEM DETAILS

REAR-END

• TANK

A container used for storing liquid phase LPG at a pressure of 10/15 bar. There exist two types of tanks:

-cylinder: it is mounted in the boot by means of special clamps and metal clips. It is hermetically sealed by means of a gas-tight housing and vent pipes.

-toroidal: it is mounted in place of the spare wheel by means of special clips or bearings.

-It is possible to mount tanks of various sizes within the allowed limit (depending on the current regulations).

Tanks do not require servicing, but they should be replaced every ten years.

• MULTIVALVE

An electro-mechanical component mounted on the tank and equipped with:

• a cut-off valve: limits the filling level to 80% of the tank capacity

• a mechanical level gauge: indicates the tank liquid level

• an overpressure safety valve: limits the tank pressure

• a thermal fuse: limits the tank pressure when the temperature reaches a predetermined value

• a manual shut-off valve/solenoid valve: opens or cuts off the LPG supply to the pressure reducer

an overflow valve: limits the LPG flow rate

• FILLER

A mechanical component which serves to fill the tank.

It is connected to the multivalve by means of an 8 mm ECU copper pipe.

FRONT-END

• REDUCER

A device designed to vaporize liquid LPG and to reduce the LPG pressure.

The component consists of:

• a liquid phase filter: filters liquid LPG from the tank

• a solenoid valve: opens or cuts off the gas supply

• a water temperature sensor: monitors the reducer temperature

• an overpressure valve: limits the pressure inside the reducer

• FILTER

The gaseous phase LPG filter is preset to prevent dirt from entering the electro-injectors and/or the engine combustion.

• ELECTRO-INJECTORS

A device which controls the injection of gas into the engine.

It consists of frequency controlled solenoid valves whose resistance is 14 Ohm.

There are three different types of nozzle calibration depending on the “power by cylinder” value of the car.

• ECU

A device which controls the LPG flow rate required by the engine by opening and closing the electro-injectors.

It is preset to automatically cut off the LPG supply in case the engine fails and/or stalls.

• WIRING

The electrical wiring connects the ECU to various system actuators. The connectors included in the kit are hermetic.

• CHANGEOVER SWITCH BUZZER

It is a button which enables the driver to control various functions of the system. The control consists of:

• 1 red LED: situated down on the right, indicates the current fuel status

• 4 green and 1 red LEDs: situated in the upper part of the switch, indicate the current LPG status and the LPG tank level

• a buzzer: indicates the fuel mode changeover or system anomalies by means of sound signals.

OTHER

• PIPING ACCESSORIES

The system comes with a set of copper (for high pressure LPG connections) and rubber (for low pressure LPG connections) piping, homologated in accordance with the current regulations.

The kits are also equipped with a set of minor accessories (clips, clamps, screw bolts) necessary for the installation of the piping and various injection kit components.