Exam 29: Cummins Hpi-Tp

Which of the following specifications describes the peak injection pressure capability of an HPI-TP injector?

When comparing the operation of HPI-TP injectors with electronic unit injectors (EUIs) using hydraulic injector nozzles, which of the following is a major advantage of the HPI-TP injector in dealing with emissions?

Where is the fuel transfer gear pump located in a Cummins HPI-TP fuel sub-system?

Which of the following features gave the HPI-TP injected engine a major advantage in controlling emissions when compared to an engine fueled by EUIs equipped with hydraulic nozzles?

Which of the following will determine how much fuel is injected by a Cummins HPI-TP injector in any given cycle?

At the completion of the Cummins HPI-TP injector pumping stroke, where is the fuel in the timing chamber routed?

What type of signal is used to control Cummins HPI-TP timing and fueling actuators?

What is the approximate rail pressure used in a Cummins HPI-TP fuel management system?

Where are the electronics that manage the timing and metering actuators housed?

What is used on an HPI-TP injector to prevent back-pressurizing of the fuel rail by the metering chamber when the injector is first actuated (pre-injection) by the camshaft?

What does the T represent in the Cummins acronym HPI-TP?

How much fuel should remain in the HPI-TP injector timing chamber at the completion of an injection cycle?

What must be used to troubleshoot the Cummins ISX, HPI-TP fuel system?

Technician A says that the amount of fuel metered to the HPI-TP metering chamber depends on ECM managed rail pressure at any given moment of operation. Technician B says that all of the fuel injected into the engine cylinder by an HPI-TP injector must pass through the metering actuator. Who is correct?

How many ECM actuators are located on the rail of a Cummins ISX engine using HPI-TP fuel management?

Where would you find a GoreTex seal on a Cummins ISX engine?

Technician A says that the fuel filter used in the Cummins HPI-TP fuel system can either be under pressure or suction, depending on when the engine was manufactured. Technician B says that fuel movement through the fuel subsystem in an ISX engine is created by a gear type fuel transfer pump. Who is correct?

Technician A says that both the timing and metering actuators are exposed to identical rail fuel pressure at any given moment of operation. Technician B says that one timing actuator manages fuel delivered to the injector timing chambers in the injectors fueling cylinders 1, 5 and 3. Who is correct?

Technician A says that a pre-2010 ISX engine uses concept gears in the timing gear train. Technician B says that the ISX engine uses a single slab cylinder head. Who is correct?

Technician A says that the HPI-TP injector uses open-nozzle technology. Technician B says that an HPI-TP injector will have a variable beginning and hard value, constant ending to its injection cycle. Who is correct?