Cummins engine parts Fuel injection pump supply pipe C5689704

Built as a critical component for the common-rail fuel system, this supply pipe features a reinforced structure to withstand high fuel pressure. The pipe body is made of seamless cold-drawn steel (ST52.3) with a wall thickness of 3.5mm, capable of enduring 8MPa working pressure (burst pressure ≥24MPa)—far exceeding the X15 engine’s fuel supply pressure of 3-5MPa. A spiral-wound stainless steel reinforcement layer is embedded between the steel pipe and outer coating, enhancing pressure resistance by 40% and preventing pipe expansion. This design ensures consistent fuel delivery to the injection pump, avoiding pressure fluctuations that cause uneven fuel injection and engine power loss

Engineered to maximize fuel flow efficiency, the supply pipe features a precision-honed inner wall with a surface roughness of Ra ≤0.4μm—reducing fluid resistance by 30% compared to pipes with machined inner surfaces. The smooth interior prevents fuel turbulence and deposit accumulation, ensuring a steady flow rate of 80L/h at the engine’s rated speed (2100rpm). The pipe’s 90° gradual bends (instead of sharp angles) minimize flow restriction, maintaining consistent pressure at the injection pump inlet. For X15 engines in long-haul applications, this efficient flow design reduces the fuel system’s energy consumption by 2%, contributing to a 1-2% improvement in overall fuel efficiency

Optimized to resist corrosion and wear from diesel fuel and contaminants, the pipe integrates multi-layer protective features. The inner steel surface undergoes phosphatization treatment to prevent rust and chemical corrosion from sulfur-rich diesel (common in off-road applications). The outer surface is coated with a 20μm-thick epoxy resin layer that resists abrasion from engine components and road debris, passing 1000-hour Taber abrasion testing with minimal wear. The flared connections are plated with zinc-nickel alloy (10μm thickness), passing 1500-hour neutral salt spray testing (ASTM B117) to prevent rust-related leaks. These features ensure the pipe’s service life reaches ≥300,000km

The supply pipe is designed to absorb engine vibration and reduce long-term maintenance costs. A flexible rubber sleeve (HNBR material) is installed at the pipe’s midpoint, absorbing 60% of engine vibration (10-200Hz) and preventing fatigue cracking. The flared connections use compression fittings with pre-installed O-rings (FKM rubber), ensuring a leak-tight seal that avoids fuel waste and environmental contamination. Installation is simplified by the pipe’s pre-formed shape (customized for X15 engine bays), reducing routing time by 40%—two technicians can complete replacement in 60 minutes. By preventing fuel leaks and pressure losses, it avoids expensive injection pump repairs (costing up to $3,000) and unplanned downtime. Backed by a 2-year/250,000km warranty, it provides reliable value for fleet operators