Autoignition: Frequency of Fires

Many studies have published estimates of the proportion of vehicle fires that resulted from autoignition of gasoline. The vast differences in results are evidence of the difficulty of identifying ignition sources.

Butler, 1987 [1] 90% of engine compartment fires due to leaking fuel, mostly hot-surface ignition after stopping.
Fray, 1991 [2] 20% of 1,376 fires due to gasoline igniting on hot surfaces.
Hrynchuk, 1983 [3] Test conclusion: Hot manifold not sufficient to ignite gasoline.

 

Nevertheless, there is little doubt that such fires do occur and are also misattributed. It is therefore necessary to understand the mechanism and potential for autoignition of vehicle fluids.

References

  1. Butler, J.A., "Motor Vehicle Fires in Ireland and the United Kingdom,” Fire Prevention Journal, UK, 1987.

  2. Fray, M., Southall, D., Galer, I.A.R., "Reducing the Risk of Non-Electrical Car Fires," SMMT, UMTRI - 82645, 1991.

  3. Hrynchuk, R.J., "A Study of Vehicle Fires of Known Ignition Source," International Association of Arson Investigators, Alberta Chapter, Edmonton Alberta, January, 1983.