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Once LPG converted will my car start on LPG?
Both Carburetted and Fuel Injected cars can be started on LPG or petrol. With carburetted vehicles the LPG switch is normally set to default start on LPG however with EFi vehicles the system will automatically start on petrol and then change over to LPG when a preset scenario - as described below.
All LPG switches contain a gauge which is electronically linked to the tank gauge to give you an indication of LPG content.
Carburetted LPG conversions.
These vehicles will be converted using a simple draw through system and a three position switch. We would normally leave the switch in the LPG position therefore starting, running and stopping the engine on LPG. The positions are explained below.
Position 1 - LPG - When in this position the vehicle will start and run on LPG.
Position 2 - No Fuel - This is used when switching from petrol to LPG so that you can run the float bowls out of petrol before turning the LPG fuel on.
Position 3 - Petrol - Switching to this position will turn the LPG solenoids off and activate the petrol pump and solenoid.
Fuel Injected engines (pre 2000) with draw through LPG.
These engines would normally be converted with a draw through conversion with a Lambda loop control unit. With this conversion it is customary to leave the switch in the LPG position, the engine will start on petrol automatically and at this point the Orange LPG light on the switch with be flashing. This means that the system is ready and waiting to turn over to LPG.
We program our systems to change to LPG once the engine rpm falls down through 1800 rpm. Once this has happened the engine will run on LPG until you turn the engine off and then the switch will automatically start the engine on petrol again as before.
These switches have two positions.
Position 1 - LPG - In this position the engine will start on petrol and then change to LPG when the preset scenario has happened.
Position 2 - Petrol - When in this position the engine will run on petrol.
What if I need to start my engine on LPG?
This can be done with this system by the following process.
1 - Switch the ignition on
2 - Rock the LPG switch over to the petrol position and then back to the LPG position. You should notice that the LPG Orange light is now on and not flashing
3 - Start the engine with your foot depressed on the throttle about 1/4 of the way to full throttle. It may take a few seconds for the engine to start as LPG has to be drawn into the engine.
Fuel Injected engines (post 2000) with sequential injected LPG.
These engines need to be converted with sequential injected LPG as explained in our conversion information. This LPG switch is a digital button which switches between LPG and petrol. This switch, when in the LPG position, will automatically start the engine on petrol and then switch to LPG when the engine has reached a pre set temperature and rpm. When we set our systems this is approx. 45 degrees C and 2000 rpm. Once the engine has changed over to LPG it will then run on LPG until you stop the engine, then the cycle will repeat itself when started again.
This switch has two positions as explained below.
Position 1 - LPG - In this position the engine will start on petrol and then change to LPG when the preset scenario has happened.
Position 2 - Petrol - When in this position the engine will run on petrol.
What if I need to start my engine on LPG?
Although the injected LPG system can be started on LPG, this should only be done if necessary - for example if your petrol pump is not working.
This can be done with this system by the following process.
1 - Switch the ignition on and press the LPG button to the petrol position.
2 - Disconnect and the re-connect the LPG switch.
3 - Holt the LPG button until the yellow LPG light comes on.
4 - Start the engine.
All of our LPG systems can be seen and purchased here | 
