Supply Pump The supply pump pressurizes fuel up to 1,800 bar and sends it to the common rail. The fuel pressure in the common rail is detected by the high-pressure sensor and controlled by adjusting an electromagnetic valve of the supply pump. DENSO has three types of supply pumps.

Product Types

• HP-3 (for passenger cars and light-duty vehicles)
• HP-4 (for medium-duty vehicles)
• HP-0 (for heavy-duty vehicles, available up to 1,600 bar)

Benefits and Features

• Generates high fuel pressure – up to 1,800 bar
  • Adapting an outer cam structure rather than an inner cam structure reduces the surface pressure applied to the sliding part of the plunger that pressurizes fuel.
  • The plunger is made of a newly developed material with very little foreign matter and the sliding part of the plunger is coated with a ceramic material, improving fatigue limit of the plunger.
• Light weight
  • Using aluminum for pump housing parts that are not exposed to high pressure achieves the world’s lightest supply pump for the common rail system.
• Precise control of fuel pressure in the common rail
  • The supply pump sends only a required amount of fuel to the common rail through the electromagnetic valve, precisely controlling the fuel pressure in the common rail.

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