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The term Mechanical when applied to fuel injection is used to indicate that metering functions of the fuel injection -how the correct amount of fuel for any given situation is determined and delivered- is not achieved electronically but rather through mechanical means alone. All the components in both mechanical or Electronic Fuel Injection (EFI) systems that deliver the fuel in to the engine -the pumps, plumbing, valves, injectors- are mechanical in operation. The difference being that in EFI systems the injectors are switched on and off electronically by the EFI control electronics. This ability to control the injectors electronically allows far more variation in when and how the fuel is injected.

HEUI System Test Stand

In 1993, CAT introduced "Hydraulically-actuated Electronic Unit Injection" (HEUI), where the injectors are no longer camshaft operated. First available on Navistar's 7.3 L, V8 diesel engine. HEUI uses engine oil pressure to power high pressure fuel injection, where usual method of unit injector operation is the engine camshaft. Caterpillar 3126B

VP37 Pump Tester

The repair tester for BOSCH VP37 pump simulates the outputs of an Engine Control Unit (ECU), to control fuel injection quantity by driving the proportional rotary-magnet actuator. The injection quantity consistency under different engine speeds or different fuel injection deliveries can be tested by this tester.

Repair Test Kit for EUP and EUI

Unit Injector (abbrev. UI) is a diesel engine fuel injection system, combining the injection pump and the injector nozzle in a single component, which is (usually) driven by the engine camshaft. The Unit Pump system is a modular high-pressure diesel injection system, which is closely related to the Unit Injector system (UI), and is designed for use in commercial vehicle diesel engines.

Common Rail Injector Tester

The common rail injector is fed by a high pressure fuel source, which may be a mechanical manual pump or an electrical motor driven pump or a pneumatic driven pressure booster. Such a test device will fulfill the tasks of checking nozzle spray pattern, injector back leakage and solenoid condition.

Common Rail System Tester For Denso-U2

A standard diesel fuel injection pump test stand with a CR system tester will achieve most tasks for repairing a Denso ECD-U2 system and the components, such as injection quantities, injector fuel return, nozzle injection spray atomization, pump condition and fuel rail pressure control.

Common Rail System Tester For Bosch, Delphi, Denso

Common rail direct fuel injection is a modern variant of direct fuel injection system for petrol and diesel engines. On diesel engines, it features a high-pressure, or high-pressure fuel line to mechanical valves controlled by cams on the camshaft. Third-generation common rail diesels now feature piezoelectric injectors for increased precision, with fuel pressures up to 1,800 bars (26,000 psi).