Claims:1. A high pressure fuel pump (10), said high pressure fuel pump (10) comprising: a housing (12); 10
a plunger (14) positioned within said housing (12), said plunger (14) adapted to reciprocate within said housing (12); a vertical groove (16) defined in said plunger (14), said vertical groove (16) adapted to extend along a sidewall of said plunger (14); a first helical groove (18) in flow communication with the vertical groove (16) 15
and extending angularly along a sidewall of said plunger (14); characterized in that a second helical groove (20) in flow communication with the first helical groove (18) and extending partially along a circumference of said plunger (14), wherein a width of the second helical groove (20) is lesser than a width of the 20
first helical groove (18), and wherein a depth of the second helical groove (20) is lesser than a depth of the first helical groove (18).
2. The high pressure fuel pump (10) in accordance with Claim 1 wherein the second helical groove (20) extends from the vertical groove (16) that is defined 25
on the plunger (14) to an end of the first helical groove (18), and culminates at a termination of the first helical groove (18).
3. The high pressure fuel pump (10) in accordance with Claim 1 wherein a length of the second helical groove (20) is equal to a length of the first helical groove 30
(18), and wherein the first helical groove (18) and the second helical groove (20) have a common boundary defined between the first helical groove (18) 5
and the second helical groove (20). , Description:A high pressure fuel pump 10 is described. The high pressure fuel pump 10 comprises a housing 12, and a plunger 14 positioned within the housing 12. The plunger 14 is adapted to reciprocate within the housing 12. A vertical groove 16 is defined in the plunger 14, the vertical groove 16 adapted to extend along a sidewall of the plunger 10
14. A first helical groove 18 is in flow communication with the vertical groove 16 and extends angularly along a sidewall of the plunger 14. A second helical groove 20 is in flow communication with the first helical groove 18 and extends partially along a circumference of the plunger 14, wherein a width of the second helical groove 20 is lesser than a width of the first helical groove 18, and wherein a depth of second helical 15
groove 20 is lesser than a depth of first helical groove 18.