Place of Origin:
China
Brand Name:
CAT
Model Number:
553-8165
The 553-8165 (5538165) fuel pump assembly is the high pressure common rail unit listed for the four cylinder CAT C4.4 diesel engine. This page confirms the official assembly name, separates the three fuel systems that share the same engine badge, and identifies the low cost lift pump that is frequently quoted in place of this high pressure unit.
| Product Name | Fuel pump assembly, high pressure common rail |
|---|---|
| Official Description | PUMP AS-FUEL, listed for the four cylinder C4.4 engine |
| Part Figure | 553-8165, written 5538165 without the dash |
| Neighbouring Figure | 553-8167 is a common rail injector for the smaller 3.6 litre engine, not a pump |
| Engine | C4.4 four cylinder, 4.4 litre class |
| Same Badge, Other Systems | Mechanical builds use 324-0532, 2641A405, 295-9125, 272-2290, 236-8228, 277-5192, 271-2265, 307-3063, 326-4635 and 375-2647; an electronic build uses 294000-1381 with 370-8363 |
| Lift Pump | 446-5409 and 446-5411 are 24 volt transfer pumps and are not this assembly |
| Control | Inlet metering valve with rail pressure closed loop |
| Condition Offered | New aftermarket, genuine on request |
| Packing | Port caps fitted, valve protected, foam blocked carton |
| One Digit Apart | The pump and a fuel injector from a smaller engine sit next to each other in the same parts block, and a buyer reading a worn plate can order either one. |
|---|---|
| Three Systems, One Badge | The same engine name covers a mechanical pump era, an electronically governed era and a common rail era, and the three are not related by casting or by pipework. |
| Predecessor Confusion | The engine this unit replaced is still in service under a different designation, and its pumps are quoted freely against this figure. |
| The Cheap Numbers | Two 24 volt transfer pumps circulate at a fraction of this price, and an enquiry quoting them is asking for a lift pump rather than a high pressure unit. |
| Price Reality | A genuine assembly of this type retails in the thousands of euro, so the aftermarket band is where most export orders land. |
| Caution – Rail Flush | Metal from a worn pump reaches the rail and every injector, so the rail, pipes and tank are cleaned before the new unit runs. |
| Caution – Leak Off | Injector return flow is measured first, because excess leak off produces the same low power complaint as a tired pump. |
| Caution – Metering Valve | The inlet valve belongs to the calibration, and a valve taken from another build gives a rough idle and a pressure code. |
| Caution – Drive Coupling | The coupling is keyed and the flange marked, and a gear one tooth out will crank without starting. |
| Caution – Water In Fuel | Water passing the separator is the usual reason a replacement fails within a season, so the filter is serviced together with the pump. |
| Related Components | Injectors, rail, pressure sensor, metering valve, high pressure pipes, lift pump, filter head. |
No, that is an injector for a smaller engine.
No, only the common rail generation.
No, the pipework and control differ completely.
Those are 24 volt transfer pumps.
Sealing cones, filter and a rail flush.
No code is stored in the pump body.
Send your inquiry directly to us
english
français
Deutsch
Italiano
Русский
Español
português
Nederlandse
ελληνικά
日本語
한국
polski
فارسی
বাংলা
ไทย
tiếng Việt
العربية
हिन्दी
Türkçe
indonesia
