Balance between the governor flyweights and control lever position controls the metering of the amount of fuel to be injected. The fuel injection pump governor performance and setting can affect engine power. Special equipment and qualified personnel are required to verify governor performance. If the seals are broken on the external Robert Bosch VE adjustment… Read More »
The fuel injection pumps, Bosch VE, Lucas CAV DPA, Stanadyne DB4, and Lucas CAV DPS, are rotary distributor pumps. These pumps perform the four basic functions of: 1. Producing the high fuel pressure required for injection. 2. Metering the exact amount of fuel for each injection cycle. 3. Distributing the high pressure, metered fuel to… Read More »
Filtration and separation of water from the fuel is important for trouble-free operation and long life of the fuel system. Some of the clearances between the fuel injection pump parts are very close. For this reason, the parts can easily be damaged by rust formation and contaminants. Be sure to use the correct elem ent.… Read More »
A replacement of fuel supply lines, fuel filters, fuel injection pump, high pressure fuel lines and injectors will let air enter the fuel system. Follow the specified procedure to bleed the air from the system. Since the fuel transfer pump provides a positive pressure through the fuel filter and fuel supply line to the fuel… Read More »
The B series engine uses three different piston style fuel transfer pumps. All three deliver different flow volumes. Piston style fuel transfer pump, Part No. 3918076, is offered as an option on B series engines equipped with distributor type fuel injection pumps. NOTE: Part No. 3918076 and 3918000 are identical in appearance. The pumping spring… Read More »
The output of the fuel transfer pump can be checked two ways. Test 1: Measure the output pressure using an in-line pressure gauge. Test 2: Measure the flow volume. Test 1: Output Pressure Test (Diaphragm Style) Start the engine and measure the output pressure of the fuel transfer pump using an in-line pressure gauge. Test… Read More »
A malfunctioning fuel transfer pump can cause low power from the engine. The diaphragm style pump cannot be cleaned and rebuilt. The transfer pump is mechanically driven by a lobe on the camshaft. Wear on the lever or a damaged lobe can reduce the pumping action. (A) – Do not operate the fuel system with… Read More »
The following special tools are recommended to perform procedures in Section 5. The use of these tools is shown in the appropriate procedure. These tools can be purchased from your local Cummins Authorized Repair Location.
Beginning in 1991, the B Series engine will use six different fuel injection pumps depending on the horsepower rating and application. The Lucas CAV DPA distributor type fuel injection pump. • Marine • Industrial The Lucas CAV DPS distributor type fuel injection pump. • European automotive ratings. The Bosch VE distributor type fuel injection pump.… Read More »
The following illustration identifies the components of the fuel system.