Abstract: A fuel injection control system for an internal combustion engine is capable of expanding a correction allowable range employed in correcting a fuel injection quantity when refueling is detected. The fuel injection control system estimates a fuel property of fuel injected into the internal combustion engine after the correction allowable range is expanded and sets the correction allowable range on the basis of the estimated fuel property.

Abstract: A fuel injection control system for an internal combustion engine is capable of expanding a correction allowable range employed in correcting a fuel injection quantity when refueling is detected. The fuel injection control system estimates a fuel property of fuel injected into the internal combustion engine after the correction allowable range is expanded and sets the correction allowable range on the basis of the estimated fuel property.

Abstract: A fuel distributor pipe for supplying fuel to two cylinder banks of a V-shaped engine comprises main pipes of metal construction which are respectively fixed substantially horizontally with respect to the cylinder banks, and a sub-pipe of metal construction which connects the main pipes. The sub-pipe comprises three curved portions in a vertical plane comprising two convex portions and one concave portion situated therebetween. When there is an error in the vertical direction of the position of connecting parts between the sub-pipe and main pipes, these curved portions disperse the stress due to the error, and concentration of stress in the connecting parts is avoided.