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One of the most common problems we are asked to investigate is just this....."It smells of gas......"
The first thing we do is to check for leaks using a gas detector, but in a high percentage of cases no leak is found.
The cause is often simple, but not widely understood.
Vehicles with single point mixer systems -
When the vehicle's engine is switched off from gas operation, some gas will naturally be present in the induction system and remain unused. The gas is heavier than air and will tend to 'sink' to the lowest level possible. If the pipe from the inlet manifold (where the gas mixer is often sited) is sloping downward the remaining gas will seep down into the air filter and may well escape to atmosphere, resulting in the smell.
This effect is called 'Gas leakdown'. It is not a dangerous condition as the gas is in low concentration, further reducing as it mixes with the surrounding air. The next time the engine is started, no gas will leak down as it is all drawn into the engine, but the next time it is stopped identical conditions will arise and the smell may reappear. It would not be unreasonable for a driver to imagine that the smell is present when the car is running, giving the impression that the system is leaking all of the time.
. Most reported 'Smells of Gas' present no immediate danger, and do not indicate that there is a problem with the gas system or its installation.
2. The effect can be cured by asking the installer to fit timed shutdown equipment or by the driver simply making sure than the engine is always run down on Petrol for at least one minute before stopping it.
Some basic facts -
People running Petrol cars have become accustomed to a slight smell of Petrol being present if the bonnet is opened. Likewise, those running Diesels are not the slightest bit surprised if they smell Diesel when they open the bonnet. Both are most likely to be the effect of fuel 'leakdown' from the induction system but are ignored as being quite normal.
However, if the vehicle is converted to run on LPG, a new smell (actually the chemical marker added to the gas in production) can cause great alarm, but actually indicate no increase in risk.
And finally......
Don't be TOO comforted by this explanation and ignore ALL 'Smells of Gas'!
If you think you may have a leak, DO go and get it checked out (we'll do it for free) and make sure no serious condition exists. Just be a slightly more ready to accept that sometimes a whiff or two of LPG does not indicate that your gas system has been badly fitted by your installer or that it is in a dangerous condition now.
One of the most common problems we are asked to investigate is just this....."It smells of gas......"
The first thing we do is to check for leaks using a gas detector, but in a high percentage of cases no leak is found.
The cause is often simple, but not widely understood.
Vehicles with single point mixer systems -
When the vehicle's engine is switched off from gas operation, some gas will naturally be present in the induction system and remain unused. The gas is heavier than air and will tend to 'sink' to the lowest level possible. If the pipe from the inlet manifold (where the gas mixer is often sited) is sloping downward the remaining gas will seep down into the air filter and may well escape to atmosphere, resulting in the smell.
This effect is called 'Gas leakdown'. It is not a dangerous condition as the gas is in low concentration, further reducing as it mixes with the surrounding air. The next time the engine is started, no gas will leak down as it is all drawn into the engine, but the next time it is stopped identical conditions will arise and the smell may reappear. It would not be unreasonable for a driver to imagine that the smell is present when the car is running, giving the impression that the system is leaking all of the time.
. Most reported 'Smells of Gas' present no immediate danger, and do not indicate that there is a problem with the gas system or its installation.
2. The effect can be cured by asking the installer to fit timed shutdown equipment or by the driver simply making sure than the engine is always run down on Petrol for at least one minute before stopping it.
Some basic facts -
People running Petrol cars have become accustomed to a slight smell of Petrol being present if the bonnet is opened. Likewise, those running Diesels are not the slightest bit surprised if they smell Diesel when they open the bonnet. Both are most likely to be the effect of fuel 'leakdown' from the induction system but are ignored as being quite normal.
However, if the vehicle is converted to run on LPG, a new smell (actually the chemical marker added to the gas in production) can cause great alarm, but actually indicate no increase in risk.
And finally......
Don't be TOO comforted by this explanation and ignore ALL 'Smells of Gas'!
If you think you may have a leak, DO go and get it checked out (we'll do it for free) and make sure no serious condition exists. Just be a slightly more ready to accept that sometimes a whiff or two of LPG does not indicate that your gas system has been badly fitted by your installer or that it is in a dangerous condition now.
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