Engine fuel injectors · Injection system and pressure class, solenoid versus piezo actuation, multiple injections, engine power class, and OE part-number matching
A fuel injector meters fuel and sprays it into an engine's intake port or combustion chamber, opened by a solenoid or piezo actuator or, in mechanical systems, by fuel pressure. Pin down three things before asking for a price: the injection system and pressure class the injector belongs to, the engine and power class it serves, and the exact OE part number and calibration it must match.
Diesel common-rail, unit and mechanical-nozzle injectors and gasoline port and direct injectors for vehicle, off-road and generator engines, new or remanufactured. Injection pumps, high-pressure fuel rails, nozzle-only spare parts, springs and injector test benches are outside this page.
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Bosch lists its diesel common-rail system with pressure-compensated solenoid injectors for injection pressures up to 2,500 bar and specific outputs of 90 kW/l, and its piezo-injector common-rail system for up to 2,700 bar and up to 100 kW/l, both offering multiple injections. [1] [2] Its mechanical single-cylinder pump systems use nozzle holder assemblies with injection pressures up to 1,800 bar, the nozzle holder being selected to match delivery rate, spray form and injection pressure. [3]
For gasoline engines Bosch describes direct injection, in which the fuel supply delivers fuel at up to 6 bar to a high-pressure pump that supplies the rail and high-pressure injectors at up to 350 bar, and port fuel injection as a low-pressure system at about 6 bar with two injectors per intake manifold in some designs. [4] [5]
Editorial calculation: 2,500 bar is 250 MPa and 350 bar is 35 MPa (1 bar = 0.1 MPa), so the Operating Pressure field differs by more than seven times between a diesel common-rail and a gasoline direct injector, and by over 400 times between diesel common-rail and port injection at about 6 bar (0.6 MPa).
Editorial note: an injector built for one system will not work in another, even if it fits the engine. Identify the system from the engine and OE documentation first.
Give the supplier the engine make, model and serial range, OE injector part number and calibration (trim) code, injection system, fuel (diesel, gasoline, other), new or remanufactured, connector type, quantity, and any test-bench data required with delivery.
02
PHINIA lists its DFI1 diesel injectors for light-duty applications up to 175 kW at pressures up to 2,200 bar, and its DFI2 family for medium-duty on- and off-highway engines up to 250 kW (60 kW per cylinder), in production at 2,000 bar and extendable to 2,200 bar. It cites up to 9 injection events per cycle, injection separation below 0.2 ms and closed-loop control of injection quantity. Its F3 heavy-duty common-rail system is capable of 3,000 bar. [6]
Bosch says the injected quantity must be adapted to the air mass measured by a hot-film air-mass sensor, and describes a digital rate-shaping strategy that shortens the delay between pre-injection and main injection on its solenoid system. [1]
Editorial note: multiple injections and closed-loop quantity control depend on the engine control unit working with the injector's characteristics. Replacement injectors on electronically controlled engines may need their calibration code entered into the ECU, so request the code with each injector.
Linked suppliers list common-rail injectors, unit injectors, injector assemblies and OE-numbered replacements for commercial and passenger engines. [7] [8]
03
Suppliers linked to this page list fuel injectors; each card links to the page reviewed.
The listings reviewed cover common-rail and unit injectors, mechanical nozzles and injector assemblies for diesel and gasoline engines, including replacements listed by OE number; ask each whether parts are new or remanufactured and for test-bench flow data.
04
This is a functional reference built from the sources cited; it is not one maker's specification.
| Part | Role | Fix in the order |
|---|---|---|
| Actuator | Solenoid or piezo opens the valve. [1] [2] | Type; connector. |
| Control valve | Sets timing and multiple injections. [6] [1] | Calibration code. |
| Nozzle | Sets spray form and delivery rate. [3] | Nozzle type; holes. |
| Body and high-pressure inlet | Withstands rail pressure. [1] [2] | Pressure class. |
| Nozzle holder (mechanical) | Holds nozzle; matched to pump. [3] | Holder type. |
| Seals and clamps | Seat in cylinder head. | Seal kit. |
05
A fuel injector quotation needs values for your engine. The table explains each field, gives published values where a reviewed source states them, and says what to obtain from the supplier.
| Field | What it means and published values | Ask the supplier for |
|---|---|---|
| Operating Pressure (MPa) | Diesel CR up to 250–270 MPa; GDI 35 MPa; port about 0.6 MPa (from bar). [1] [2] [4] [5] | System pressure. |
| Flow Rate (cm³/min) | Static flow or delivery per stroke. | Test-bench data. |
| Spray Angle (°) | Spray form matched to engine. [3] [5] | Angle; pattern. |
| Coil Resistance (Ω) | Solenoid injectors. | Value. |
| Operating Voltage (V DC) | Drive circuit. | Voltage. |
| Response Time (ms) | Injection separation below 0.2 ms quoted. [6] | Opening and closing time. |
| Leakage Rate (cm³/min) | Return or back-leak flow. | Test limit. |
| Operating Temperature (°C) | Engine bay and fuel temperature. | Range. |
| Ingress Protection | Connector sealing. | Rating. |
| Body Material (SS) | High-pressure body. | Material. |
| Weight (g) | Per injector. | Weight. |
06
Paste it into your enquiry below or into an email to a maker, then replace every bracket.
Engine: [make; model; serial range; power] System: [common rail; unit injector; mechanical; GDI; port] Part: [OE number; calibration code] Fuel: [diesel; gasoline; other] Condition: [new; remanufactured] Testing: [bench data; flow; leak] Quantity: [per part number]
These companies list fuel injectors.
Lists diesel fuel injectors, common-rail injectors and common-rail injector systems with nozzles and plungers.
Product scope checked 2026-10-11
Lists unit injectors and injectors alongside nozzles, elements and injection pumps.
Product scope checked 2026-10-11
Presents itself as a fuel injection equipment manufacturer listing diesel injectors.
Product scope checked 2026-10-11
Lists an OE-numbered fuel injector among its export auto parts.
Product scope checked 2026-10-11
Publishes a fuel injector catalogue among its auto parts.
Product scope checked 2026-10-11
Explore company information and manufacturing capabilities, then discuss the scope of your project with a relevant supplier.
Bosch lists up to 2,500 bar for solenoid and 2,700 bar for piezo common-rail systems. [1] [2]
Bosch describes port fuel injection as a low-pressure system at about 6 bar. [5]
PHINIA cites up to 9 injection events per cycle for its light- and medium-duty injectors. [6]
Bosch lists nozzle holder assemblies with injection pressures up to 1,800 bar. [3]
Sources checked 2026-10-12. Bosch and PHINIA are injection-system makers publishing pressure, power and injection-event data; Hongbeng and Chinahanji are linked suppliers.
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