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What you should know about your LPG system


There are only around 40,000 LPG powered vehicles on UK roads right now, so general awareness of one or two potentially important facts is quite low. Repair garages and roadside rescue services may not be familiar with the LPG system and you might be able to help yourself sometime.

Here are a few things that might stand you in good stead for LPG motoring.

Here is a picture of a typical multivalve. It is sited inside the airbox fitted to your LPG tank. You can see the solenoid pointing toward you on the top left of the multivalve and the manual isolator valve on the middle left. To isolate the LPG tank from both the supply pipe to the engine and the filler pipe to the filler, turn the valve clockwise (screw it in). It's a good idea to know where it is and how it operates, even if you only use it to shut down the tank when on holiday or as an anti-theft device. It might be much more important in the event of a collision. A typical multivalve unit

Solenoid Solenoid Manual isolator valve Manual isolator valve Safety valve Safety valve


The airbox as it appears fitted to the tank. The vent pipe leads off to the bottom right of the picture. Here's a picture of the vent pipe (black tube in lower right of the picture) leading from the airbox which exits below the vehicle. LPG vapour is heavier than air and it will tend to sink. If there is a leak in the multivalve area any escaped gas will be automatically vented to the outside air below the car. It is important that the vent pipe is not displaced, crushed or damaged by articles placed in the load space and the exit hole must be kept clear at all times.
The picture on the right shows the vent pipe exiting through the boot floor. Normally, one of the LPG pipes (either the filler or supply pipe) will also exit through the vent pipe (as shown in the picture). Drivers of off-road vehicles might want to pay special attention to this as it can easily become blocked by mud or debris.
Keep it clear!
The vent pipe exits the floor of the vehicle and is designed to dump any escaped gas overboard
This picture shows a fuse block similar to the one you may have included in the electrics of your LPG system. Depending on the type of system you have, there may be two or more fuses protecting different circuits. Ideally the installer will have placed it (or them) close to the original fusebox or in an easily accessible position under the bonnet. You should know where they are. If a fuse blows for any reason then make sure you only replace it with fuses of the same value. Using a fuse that is over the original rating may cause a fire if there is a short in the circuit. If you replace a fuse once, and it blows once more, don't replace it again until you have had the circuit checked and the fault repaired. A typical fuseblock. The fuse is shown removed and simply clips into the block, connecting the two terminals.
The final picture shows the manual tank isolation valve being closed (turned clockwise). It is normally situated on the mutivalve placed inside the airbox. This valve will completely isolate the LPG tank, as it closes of both the filler entry port and the gas supply to the engine.

Interesting side-benefits of the manual isolator valve are (a) that it can be used to isolate the tank if the vehicle is not going to be used for a long period (closing the valve is recommended in these circumstances, e.g. if you are going on holiday) and (b) that it may be used as a very effective anti-theft device. Your car will not go far if the switch is set to 'Gas' and the tank isolator is closed!

With the aibox cover removed, it is a simple matter to isolate the LPG tank by closing the isolator valve.
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