Buy wp20600 - Genuine Cummins Fuel Injection Pump 8.9L ISC/ISL - 2 - wisentpartscenter.com

Description

Genuine Cummins 4954315NX Fuel Injection Pump is a high-pressure CAPS / CAPS II fuel pump used on Cummins ISC 8.3L and ISL 8.9L diesel engines. The Cummins Accumulator Pump System stores pressurized fuel in an accumulator and electronically controls fuel pressure and injection delivery to the engine. Cummins service literature describes CAPS as a distributor-type electronically controlled injection system.

Key Functions

- Generates and maintains the fuel pressure required by the CAPS injection system.
- Supplies pressurized fuel to the accumulator for injection events.
- Works with ECM-controlled pumping and injection control valves.
- Provides regulated fuel delivery as engine speed and load change.

Fitment & Specifications

- Engine Family: Cummins ISC / ISL
- ISC Displacement: 8.3L
- ISL Displacement: 8.9L
- Component Type: Fuel Injection Pump / High-Pressure Fuel Pump
- Fuel System: Cummins CAPS / CAPS II
- Fuel: Diesel
- Documented Related Applications: QSC 8.3L and QSL 9L configurations depending on pump number
- Pump Configuration: Application-specific within the CAPS family

Several of the supplied numbers are documented together for Cummins ISC 8.3L and ISL 8.9L applications, but the complete number list spans more than one production/service configuration. Exact pump number and engine serial number should therefore be matched before installation.

Verify fitment with us before ordering to ensure the correct part for your application.

Purpose of the Part

The 4954315NX supplies the pressurized fuel required by the Cummins CAPS injection system. The pump fills an accumulator with high-pressure fuel while ECM-controlled valves regulate accumulator pressure and determine when fuel is delivered for each injection event.

Issue Symptoms / When to Replace

A failing fuel injection pump can cause hard starting, extended cranking, loss of power under load, unstable idle, engine stalling, or insufficient fuel pressure. The engine may also develop fuel-system fault codes when the pump cannot maintain the pressure requested by the ECM. Restricted fuel supply, contaminated fuel, wiring faults, control-valve problems, or low-pressure supply issues can produce similar symptoms and should be checked before replacing the pump.

Brand Information

Cummins developed the CAPS — Cummins Accumulator Pump System for electronically controlled ISC, ISL, and related engine applications. Unlike a conventional mechanical injection pump, CAPS combines an accumulator, electronically controlled pumping valves, an injection control valve, and a distributor section to regulate fuel delivery.

Genuine Cummins service pumps are available under several production, exchange, and ReCon numbers depending on the original engine and service configuration.

Installation Notes

Before installation, verify the original pump number and engine serial number because this number family covers several ISC/ISL CAPS service configurations. Keep all fuel connections clean, inspect the supply system and fuel lines for contamination or restrictions, and make sure the cause of the original pump failure has been corrected. Prime the fuel system according to the Cummins procedure after installation and check all connections carefully for leakage before returning the engine to service.

How to Identify an OEM Part

A genuine 4954315NX can be identified by the Cummins factory identification on the pump and the complete Cummins part number shown on the manufacturer label or identification plate. Because several CAPS pumps have a similar external appearance, use the complete pump number rather than housing shape alone.

Why Buy 4954315NX From Wisent Parts Center?

  • 1 Year
    Warranty

  • Genuine Parts

    Authentic OEM parts

  • 30-Day Returns

    Conditions apply

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 1-year warranty on all parts from the date of delivery. This warranty covers orders placed directly through our website. If a part fails during this period, we’re here to help - whether it’s a replacement, repair, or refund. For full details, refer to the Warranty page.

Return Information

Wisent Parts accepts returns within 30 days of delivery. All returns are subject to a restocking fee. To qualify, parts must be unused and in their original condition. For full return instructions and restocking fee details, please refer to the Returns page.