主权项 |
1. A fuel pump for an internal combustion engine, comprising:
a pump housing; and a pumping unit mounted in the pump housing and including a pumping barrel having a longitudinal axis, a barrel bore extending along the longitudinal axis, a pumping plunger positioned within the barrel bore to form a pumping chamber, the pumping plunger mounted for reciprocal movement through an intake stroke to receive fuel in the pumping chamber and a pressure stroke to pump fuel under high pressure from the pumping chamber, an inlet check valve cavity in fluid communication with the pumping chamber, and an inlet check valve positioned in the inlet check valve cavity, the inlet check valve including an inlet check valve plunger mounted for reciprocal movement in the inlet check valve cavity, the inlet check valve cavity being positioned to receive an inlet flow of fuel for delivery to the pumping chamber during the pumping plunger intake stroke and positioned to receive high-pressure fuel from the pumping chamber during the pumping plunger pressure stroke. |