Bosch 2418455369 Plunger & Barrel Element (2 418 455 369) | PS / In-Line Diesel Pump Element “2455-369” — Ø12 Precision Fueling Core

If you're searching 2418455369, you're not hunting a generic "plunger." You're looking for the metering heart of an in-line (PS / "PES") diesel injection pump-the matched plunger & barrel element that determines how accurately the pump can build pressure and deliver repeatable fuel quantity to each cylinder. In the field, this part is often the difference between a diesel that starts cleanly and pulls evenly… and one that cranks longer, smokes intermittently, or feels "soft" under load even after filters have been changed.

Bosch references this element as 2418455369, and many sellers also list it as the equivalent 2 418 455 369.
In aftermarket catalogs, you may also see the stamp/short code 2455-369, which is widely used as a quick matching keyword when technicians read markings on the old part.

An in-line pump doesn't just "push fuel." It produces a high-pressure pulse at exactly the right moment for each cylinder. The plunger & barrel element is the precision pair that makes this possible:

◆ Pressure generation: tight clearances allow the pump to build injection pressure efficiently
◆ Fuel quantity control: metering edges and spill timing affect delivered volume
◆ Repeatability: stable sealing and smooth sliding motion keep cylinder fueling consistent

When wear increases internal leakage, the pump may still run-but it loses crispness: more cranking, unstable idle, smoke on throttle transitions, and uneven power delivery are common real-world symptoms.

To reduce wrong orders (and returns), list the "number family" clearly:

Bosch Part No.: 2418455369

Bosch equivalent format: 2 418 455 369

Stamp / short code: 2455-369

Product naming used in catalogs: plunger element, plunger & barrel, pump element

Some product pages describe it within PS series / in-line pump parts categories and present it as a "diesel pump plunger" for engine injection pump rebuilding.

Online listings provide several practical "confirmation anchors" that buyers like to see:

Plunger diameter: Ø12 mm (commonly stated in PS-series listings for 2418455369 / 2455-369)

Weight examples: around 0.35–0.4 kg depending on seller/packaging

Condition & warranty language: some sellers list the element as new with warranties such as 12 months (policy varies by channel)

These are exactly the details international buyers compare when sourcing pump elements online.

 

Because pump elements are best matched by pump model, not only by "vehicle model," some supplier listings attach 2418455369 to in-line pump model strings like PES6P120A120RS7287 / PES6P1…, indicating it's used in multi-cylinder in-line pump families.
Meanwhile, Spanish-language diesel parts sellers classify it explicitly as an "Elemento de bomba lineal Diesel Bosch" (Bosch in-line pump element) and reiterate the Bosch equivalence number.

Best practice: ask the buyer for the pump tag (0460… / PES… / PS…) or the old element's stamp (2455-369), then confirm 2418455369 / 2 418 455 369 before shipping.

A worn pump element doesn't only reduce pressure-it often produces messy pressure waves. That can lead to:

imperfect injector opening behavior (noisy combustion, smoke bursts)

hotter exhaust and soot buildup from uneven fueling

more stress on timing and governor compensation

Replacing the correct plunger & barrel element restores the pump's hydraulic smoothness, making the whole system easier to calibrate and more stable over time.

 

 

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