Automotive Dictionary: Blow-Back

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Automotive Dictionary: Blow-Back
Throughout this site we use many technical terms, and given the breadth of readership our site enjoys, sometimes we are remiss and incorrectly assume everyone knows what we are referring to. For those that do not, here are some explanations of the technical terms use.
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Blow-Back


The ejection of a gas or liquid from a filling orifice when its direction is suddenly reversed, such as when an engine 'kicks back' to eject petrol from the carburettor. Also encountered when over-rapid filling of the fuel tank causes air to be trapped inside until the pressure rises and ejects petrol from the filler.

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