The "Vehicle Safety Shutdown" system consists of two devices, designed to stop two elements, FUEL and SPARKS from becoming united.

These two mechanical devices are activated by means of accelerometer sensors. To activate the accelerometer sensor, the direction of impact to the vehicle could come from any direction within the 360° degrees radius. Within milliseconds of receiving a command signal from the diagnostic unit, both devices have completed their programmed functions.

This first device is named the:-

"FUEL SHUTOFF VALVE" or FSV for short.

The functions of the FSV:

  1. BLOCKS the flow of the fuel coming out of the petrol pump.
  2. ZERO'S the working pressure of the fuel system, from the fuel pump to the engine.
  3. CONVERTS this same system from high-pressure to a vacuum, negative pressure.

In anticipation, the FSV has completed the above functions within milliseconds of impact, so that if the pressurized fuel system is ruptured, the fuel will be DRAWN BACK, rather than spray and squirt everywhere.

This second device is named:-

"BATTERY ISOLATION UNIT" or the BIU for short.

The functions of the BIU:

  1. CUT the supply of electricity to the vehicle's ignition system.
  2. SEVER the power supply from the battery to the entire vehicle.

Within milliseconds of the air bags, or any other safety equipment requiring an electric signal being activated, the BIU will complete the above task.

This device has cut off the power supply from the battery to the entire vehicle, so that when the wiring becomes damaged in the accident, no sparks will be produced to ignite any leaked fuel.

Each device is programmed to activate independently to the other.


  1. The FSV is activated to prevent pressurized gasoline from spraying everywhere.
  2. The airbags and any other equipment requiring an electrical signal are activated.
  3. The BIU is activated to eliminate the risk of sparks igniting any leaked fuel.

The BIU functions – Heavy Transport Usage:

  1. Shut down the engine's fuel injection system.
  2. SEVER the power supply from the battery to the entire vehicle.

On fuel tankers, or other vehicles carrying dangerous goods, within milliseconds of impact, this device has shut down the engine and the complete electrical system. In heavy transport vehicles, because of the large mass of high amperage batteries and the heavy duty cables and wiring, the electrical system is recognized as the main source responsible for causing most truck fires.

Analysing a vehicle fire:

Car Crash Fires Resulting From:

1. Fuel leaking from a damaged fuel tank.
2. Fuel spraying everywhere when the pressurized fuel system is ruptured.

1. Fuel leaking from a damaged fuel tank:

An accident scene:

A vehicle has received a solid impact to the rear end, petrol is leaking from a ruptured fuel tank and then it has erupted in flames.

This type of accident accounts for approximately 30 – 40 percent of car crash fire.

Because the FSV is designed to control pressurized fuel, under the set of circumstances that relate to this accident, the FSV wouldn't be of any assistance.

As previously stated, as long as the "Vehicle Safety Shutdown" system can affectively eliminate either the fuel or the sparks, a fire will be averted. The BIU has to now eliminate the sparks, but this will depend on the source.

Before the fuel tank becomes ruptured and the gasoline has leaked out, as assurance against the possibility of sparks being produced from damaged electrical wiring and igniting any leaked fuel, the BIU will cut the supply of electricity from the battery to the entire electrical system and therefore avert the fire.

If this precaution weren't taken, the risk of sparks being produced from any of the following locations would be significant. The sparks could come from the apparatus's themselves being damaged, or the wiring leading to them.

  • The complete wiring harness.
  • Electric fuel pump.
  • Fuel gauge.
  • Stop lights.
  • Tail lights.
  • Blinker lights.
  • Number plate light.
  • Trunk light and switch.
  • Door and trunk locking mechanism.
  • Power window mechanism.

These two devices are unable to prevent a fire in this accident if the sparks were coming from an outside source.

Such as:

  • The other vehicle's damaged electrical system.
  • Sparks created as metal is dragged along the road surface.
  • Fallen overhead electric power cables creating sparks.
  • A spark from static electricity. (Most unlikely)

2. Fuel spraying everywhere when the pressurized fuel system is ruptured:

An accident scene:

A vehicle has a solid front impact with another vehicle, tree or telegraph pole and is engulfed in flames.

This type of accident accounts for approximately 60 – 70 percent of car crash fires.

The most probable reason for this fire is:

  1. The pressurized fuel pipes or injection system located in that region has been ruptured, squirting and spraying the fuel everywhere.
  2. The electrical wiring and starter cables also located in that region have been damaged, producing sparks that is igniting the atomised fuel.
  3. The fuel pump continued to pump more fuel out through the ruptured pipe and increased the intensity of the fire.

In this accident the FSV will prevent the high-pressure fuel from squirting and spraying everywhere and the BIU will eliminate sparks from the damaged wiring.

Even if sparks were coming from an outside source; a fire would be prevented because the FSV would have already removed the presents of any fuel.


This means that the "Vehicle Safety Shutdown" system has the potential to prevent the larger percentage of car crash fires, but it would be impossible to prevent all of them.

We acknowledge that the efficiency of the "Vehicle Safety Shutdown" system is governed by the speed that the vehicle is doing at the point of impact.

For over 100 years we didn't know how to prevent these car crash fires that resulted in shocking deaths and horrific life-debilitating injuries. Up until now a fire in a car crash has always been an accepted risk that is associated with car travel but now that we do have the equipment and the know how to reduce these fires, there shouldn't be any reason for delaying the inclusion of this safety equipment into motor vehicles.

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