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 each cylinder at the precise time.
4. Varying the timing relative to engine speed.
A single plunger or rotor is used by the fuel injection pumps to develop and distribute the high pressure required for injection.
A four-cylinder Robert Bosch VE fuel injection pump plunger is shown in this illustration.
A four-cylinder Lucas CAV DPA rotor is shown in this illustration.
A worn or damaged rotor or plunger can affect the pressure and amount of fuel injected, thus reducing the power
from the engine. Generally, if the fuel injection pump is injecting fuel from one outlet, it will deliver from all outlets.
A single rotor with two plungers is used by the Stanadyne DB4 fuel injection pump to develop and distribute the high
pressure required for fuel injection.
A four-cylinder DB4 rotor is shown in this illustration.
A worn or damaged rotor or plunger can affect the pressure and amount of fuel injected, thus reducing the power
from the engine. Generally, if the pump is injecting fuel from one outlet, it will deliver from all outlets.
