Disclosed herein is a fuel pump for an inter-cylinder direct fuel injection
apparatus, in which occurrence of corrosion and attrition caused by cavitation
or erosion can be suppressed, their resistance against the environment can be improved,
and an excellent lifetime can be achieved in the case of the use of an aluminum
material even if the temperature reaches as high as 100 C. or higher and
the pressure reaches as high as 7 to 12 MPa. In the fuel pump for an inter-cylinder
direct fuel injection apparatus, made of aluminum or an aluminum alloy, a coating
film plated with NiP or a NiP based material is formed by electroless plating.
