Fuel dribble (dripping) after injection

This occurs when the fuel supply is not precisely cutoff at the end of
fuel injection and fuel particles are accumulated on the tip of the
nozzle. If fuel dribble occurs after fuel injection, the fuel
in the cylinder will not burn completely. This will result in the
emission of black or white smoke being exhausted. To prevent fuel
dribble, the relief valve of the delivery valve is designed to draw back
any fuel that may drip out of the nozzle after injection. Fuel dribble
occurs if there is any failure in the delivery valve or injection
nozzle, as the residual pressure remains in the injection pipe after
fuel injection.

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