Fuel injection system for an internal combustion engine

A fuel injection system for an internal combustion engine, comprising:

• at least one fuel injection nozzle which, by way of a cylindrical shell body, is inserted at least in regions into a bore of a cylinder head, the at least one fuel injection nozzle being configured to feed fuel via a nozzle tip to a combustion chamber between the cylinder head and a reciprocating piston;
• a holding device by which the fuel injection nozzle is held in position on a housing section of the internal combustion engine, the holding device biasing a first end region of the fuel injection nozzle against a bore stop within the bore in the cylinder head, wherein
• the holding device has, outside the bore, a fixing bushing to which the cylindrical shell body is fixed axially and radially by way of a radial insert element,
• the holding device has a spring system acting between a first radial stop of the fuel injection nozzle and a second radial stop of the fixing bushing as viewed in a longitudinal axial direction of the cylindrical shell body, and
• the spring system is configured to bias the fixing bushing, by way of a third radial stop of the fixing bushing, against a locking element system of the radial insert element, which is supported between the third radial stop and a fourth radial stop of the cylindrical shell body.