Auto Service World
  January 13, 2016   by CARS Magazine

Bosch High-Pressure Fuel Pumps

Bosch HDP5HighPressurePumpRobert Bosch LLC is now offering high-pressure fuel pumps for a variety of vehicles equipped with gasoline direct injection (GDI) systems.

Manufactured on the same production lines as its original equipment pumps, Bosch High-Pressure Fuel Pumps for the aftermarket feature OE-level form, fit and function.

Engines equipped with GDI systems generate the air/fuel mixture directly in the combustion chamber via high-pressure injectors. Bosch says that due to higher compression, injecting the fuel directly into the combustion chamber improves cooling and engine efficiency, and ultimately leads to increased fuel economy, torque and overall vehicle performance.

“The heart of the GDI fuel system is the high-pressure fuel pump. Its function is to generate the system pressure required for high-pressure injection,” said Stephen Albert, product manager port fuel and gasoline direct injection systems, Robert Bosch LLC, Automotive Aftermarket North America.

Located off of the fuel rail, the high-pressure pump takes fuel supplied by a low-pressure, in-tank electric fuel pump operating at 65-80 psi and generates fuel pressure of up to 2900 psi (200 Bar) necessary for high-pressure injection. To put it in layman’s terms, the approximate amount of system pressure generated by a high-pressure fuel pump is equal to the weight of a three-ton truck on an area the size of a man’s shoe heel – roughly two square inches.

“In this environment, the high-pressure injectors atomize the fuel extremely rapidly to provide the optimum mixture of fuel and air directly into the combustion chamber. This demand-controlled operation optimizes fuel efficiency,” Albert explained.


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