A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises a housing 12, a cylinder head 14 located on the housing 12, and a plunger 16 located within the housing 12 and adapted to reciprocate within a bore defined within the cylinder head 14. An annular space 18 is defined between the cylinder head 14 and the housing 12, the annular space 18 adapted to receive a spring 20 therein. A seal 22 is located in the housing 12, the seal 22 held between a first static fixation 24 that is secured to the cylinder head 14 and a second static fixation 25 that is secured to a roller tappet body 40 and positioned within the annular space 18, the seal 22 prevents lubrication oil mixing with fuel within the high pressure fuel pump 10. Figure 1.
