The fuel is routed to the correct injector by the pump distributor. This traps the fuel in the chamber and allows injection pressure to build.
Once the pumping chamber is charged with fuel, the solenoid valve closes. The solenoid opens the fuel metering valve to allow fuel from the supply pump to flow into the pumping chamber. The second solenoid in the pump is used to meter fuel to the injectors. By rotating the cam ring with the timing solenoid, the fuel pump control module (FPCM) is able to advance and retard the injection timing by making the rollers contact the cam lobes either earlier or later. The rollers follow the inner diameter of the cam ring and push the pumping plungers inward whenever a cam lobe is encountered, thus building injection pressure. The pumping plungers ride on rollers that rotate inside this cam ring. The cam ring has evenly spaced lobes around its inner diameter. The timing solenoid controls the position of a cam ring inside the pump by varying internal transfer pump pressure. The fuel pump control module (FPCM) controls the timing and fueling through two solenoids located in the pump. In addition to the engine position reference pulse, the fuel pump control module (FPCM) also receives timing and fueling commands from the ECM. If the difference between the pump position and engine position becomes too great, then a fault will be logged in the fuel pump control module (FPCM). This allows the fuel pump control module (FPCM) to adjust the pump timing to compensate for minor position differences between the fuel pump shaft and the engine camshaft. By comparing this reference pulse from the ECM to the position signal from the speed sensor (IAT), the fuel pump control module (FPCM) can reference the pump's position in relation to the engine's position. 1 is sent from the ECM once every pump revolution. A reference pulse that marks top dead center (TDC) of cylinder No. The pump also contains a speed sensor (IAT) that gives the fuel pump control module (FPCM) data on the position and speed of the pump shaft. The fuel pump control module (FPCM) responds to the ECM's commands by consulting the fueling data and timing in its memory and actuating the fueling and timing solenoids.Ī fuel temperature sensor is located inside the VP44 pump to compensate for changes in the temperature of the fuel. The fuel pump control module (FPCM) communicates with the engine controller (ECM) to obtain information on desired fueling and timing. This pump has its own electronic control unit, the fuel pump control module (FPCM), which contains fueling, timing, and diagnostic data. The VP44 is an electronic fuel injection pump manufactured by Bosch®, that can vary fueling and injection timing based on input from the electronic control module (ECM). There Is A lift pump Pressure sweet point one should try to reach and use.įuel System - General Information from Cummins Link. I also added some personal thoughts highlighted in red where I piggybacked to the original authors information. I tried to clarify the differences regarding the engine applications and where some of the big bugaboo's are. Some information from Cummings, Dodge truck owner sights and sights that have collected a considerable amount of road test data while monitoring fuel lift pump pressure information and what a flow rate pressure valve on the VP-44 fuel return output line that can cause them to fail.
#Bosch vp 44 fuel injector connector tubes upgrade#
Also included pictures of connectors and adapters one might need to complete a good upgrade to improve performance and reliability. It is information meant to help owners ask the right questions. This is a lengthy article, if one reads all the information. I have tried to combine information from a number of sights to fill in the gaps. This injector pump was used from January of 1998 to 2002, NOTE ! Some of the 2003 year coach's where built on 2002 chassis and a smaller version was used on Diesel power cars and boats in the same time frame. I hope that if the reader needs some clarification, they will ask questions and hopefully get some good feedback enabling them to ask informed questions at service centers and Cummings customer service engineering help line. I understand that much of this information is beyond many on the Forum, but it should provide a coach owner a good source of questions. Regarding the VP-44 injector pump and its use in RV's.
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