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Flame arrestor.
No, a backfire is the ignition of unburnt fumes in the exhaust system.
Ignition control device
backfire flame arrestor
backfire flame arrestor
Backfire flame arrestor
Gasoline fumes are flammable. A running car generates heat and electricity and is more likely to be an ignition source.
A carburetor air intake screen.
Why is gasoline coming out of the ignition switch?
Gasoline does not ignite. The fumes from gasoline are what ignites. They will ignite at any temperature. According to the best sources I could find there are three answers (all apply to gas fumes as stated above). 1.) Flash point -43 F 2.) Ignition Temp -40 both of the above require an external source of ignition. Then ..... 3.) Auto Ignition Temp 246--280 °C (475--536 °F) Is the answer for what temp it will ignite on it's own without external 'spark'. I leaned heavily on Wikipedia for source material
The fumes are flammable just like gasoline fumes.
Compounds of the element Lead (Pb) was added to gasoline to help prevent pre-ignition, commonly known as "pinking" or "knocking". Environmental concerns required the introduction of non-leaded gasolines, which we have now. Modern cars use computer controlled spark timing and fuel injection timing to prevent pre-ignition.