A martensitic stainless steel for a fuel injection member contains, in mass %, at least 0.35% and less than 0.50% of C, more than 0.20% and at most 0.40% of Si, 0.2-0.4% of Mn, 0.25% or less of Ni, 15.0-17.0% of Cr, more than 2.0% and at most 3.0% of Mo, 0.1-0.3% of W, 0.001-0.003% of B, and at least 0.15% and less than 0.20% of N, with the remainder comprising Fe and inevitable impurities, which include 0-0.025% of P, 0-0.005% of S, 0-0.2% of Cu, 0-0.05% of Al, 0-0.02% of Ti, 0-0.02% of Nb, 0-0.15% of V, 0-0.003% of O, and 0-0.001% of H.

The invention relates to a high-pressure fuel pump (1), in particular of a common rail injection system of an internal combustion engine, having a pump cylinder head (3), having an intake valve (6) arranged in the pump cylinder head (3) in the direction of a pump cylinder axis, and a high-pressure fuel outlet (5) arranged laterally on the pump cylinder head (3), wherein a protective cap (10, 10a) at least partly covering the high-pressure fuel pump (1) is provided. According to the invention, a high-pressure fuel pump (1) having a protective cap (10, 10a) is provided, in which the protective cap (10, 10a) can be mounted without difficulty on an assembled high-pressure fuel pump (1). This is achieved in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (1) is formed in two pieces and has two protective cap parts (11a,11b) that can be fitted to each other, or else in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10a) is formed annularly and has a free clearance slot (19) interrupting the ring.

A fuel injection valve includes a body that includes an injection hole through which fuel is injected, and a valve element that opens or closes the injection hole. The body includes a metallic base material configured to form the injection hole, a corrosion-resistant layer covering a surface of at least a part of the base material that forms the injection hole and being made of a less corrosive material than the base material, and a sacrificial corrosion layer located between the base material and the corrosion-resistant layer and made of a more corrosive material than the corrosion-resistant layer.

A fuel injection valve includes a body that includes an injection hole through which fuel is injected, and a valve element that opens or closes the injection hole. The body includes a metallic base material configured to form the injection hole, a corrosion-resistant layer covering a surface of at least a part of the base material that forms the injection hole and being made of a less corrosive material than the base material, and a diffusion deterring layer located between the base material and the corrosion-resistant layer and made of a material that less easily allows a metal component of the base material to diffuse than the material of the corrosion-resistant layer.

A process for reducing injector deposits in an internal combustion engine fuelled with a fuel composition, the process comprising contacting a fuel composition with a metal-selective membrane situated in the fuel delivery system. The reduction of such deposits provides an increase in fuel efficiency, fuel thermal stability, boost in engine cleanliness, improves fuel economy and enables the possibility of using a reduced amount of expensive detergent in the fuel composition.

A martensitic stainless steel for a fuel injection member contains, in mass %, at least 0.35% and less than 0.50% of C, more than 0.20% and at most 0.40% of Si, 0.2-0.4% of Mn, 0.25% or less of Ni, 15.0-17.0% of Cr, more than 2.0% and at most 3.0% of Mo, 0.1-0.3% of W, 0.001-0.003% of B, and at least 0.15% and less than 0.20% of N, with the remainder comprising Fe and inevitable impurities, which include 0-0.025% of P, 0-0.005% of S, 0-0.2% of Cu, 0-0.05% of Al, 0-0.02% of Ti, 0-0.02% of Nb, 0-0.15% of V, 0-0.003% of O, and 0-0.001% of H.

The invention relates to a fuel injector (10), in particular a common-rail injector, comprising a valve housing (11) which can be inserted into a first receiving bore section (107) of an internal combustion machine and which has a first valve housing section (12) that faces a combustion chamber (101) of an internal combustion engine in the assembled position, said valve housing section being in contact with the combustion chamber (101) at least in some regions. At least the first valve housing section (12) consists of metal, and the first valve housing section (12) is radially surrounded by a protective element (20) in the form of a protective sleeve (21). The protective sleeve (21) extends at least over a part of the axial length of the first valve housing section (12). According to the invention, the transition region between the protective sleeve (21) and the first valve housing section (12) is sealed on the protective sleeve (21) side paired with the combustion chamber (101).

Provided is a high-pressure fuel injection pipe with a connection head which achieves an improvement in outer-surface cleanliness and prevention of a decrease in axial force and fastening strength. The pipe having, at a connection end of a narrow-diameter thick-wall steel pipe having a rust-inhibiting coating applied to an outer surface of the pipe, the connection head composed of a spherically-shaped seat surface, an annular flange, and a conical surface and having an outside peripheral surface forming formed into seat surface in a truncated conical shape or truncated arc shape for a mating seat; and a washer fitting in a neck lower part of the connection head and having a rust-inhibiting coating applied to an outer surface of the washer, wherein a contact part between the neck lower part of the connection head and an end part of the washer has a metal-to-metal contact structure without having the rust-inhibiting coating.

One aspect of this ferritic stainless steel sheet contains, by mass %, C: 0.03% or less, N: 0.05% or less, Si: 1% or less, Mn: 1.2% or less, Cr: 14% or more and 28% or less, Nb: 8(C +N) or more and 0.8% or less, and Al: 0.1% or less, with a balance being Fe and inevitable impurities, in which a film satisfying Expression 1 is formed in a surface thereof. Expression 1 is d.sub.fCr.sub.f+5(Si.sub.f+3Al.sub.f)2.0. In Expression 1, d.sub.f represents a thickness (nm) of the film, Cr.sub.f represents a Cr cationic fraction in the film, Si.sub.f represents a Si cationic fraction in the film, and Al.sub.f represents an Al cationic fraction in the film.

The invention relates to a high-pressure fuel pump (1), in particular of a common rail injection system of an internal combustion engine, having a pump cylinder head (3), having an intake valve (6) arranged in the pump cylinder head (3) in the direction of a pump cylinder axis, and a high-pressure fuel outlet (5) arranged laterally on the pump cylinder head (3), wherein a protective cap (10, 10a) at least partly covering the high-pressure fuel pump (1) is provided. According to the invention, a high-pressure fuel pump (1) having a protective cap (10, 10a) is provided, in which the protective cap (10, 10a) can be mounted without difficulty on an assembled high-pressure fuel pump (1). This is achieved in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10) is formed in two pieces and has two protective cap parts (11a, 11b) that can be fitted to each other, or else in that a plug (8) having a lateral lead connection (9) is placed on the electrically operated intake valve (6), and the protective cap (10a) is formed annularly and has a free clearance slot (19) interrupting the ring.