A tandem pump can be simply described as a low pressure fuel pump in a diesel engine which also includes a vacuum pump. They are used on engins with unit injectors and supply the fuel to the units.It is called a tandem pump because it has two functions: the first function is to act as the vacuum pump for the brake servo and the control circuits for the turbo and EGR, the second function is to supply fuel at approximately 8 to 8.5 bar to the galleries in the cylinder head and to the fuel injectors. The injectors are there to pressurise the fuel to very high pressure (2200 bar approx).
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