Cummins 4088866 — Fuel Transfer / Gear Pump (OEM & Aftermarket Options)

The Cummins 4088866 is a gear-type fuel transfer pump commonly used in a range of Cummins diesel platforms. As the low-pressure feed pump in many fuel delivery assemblies, it transfers fuel from the tank to the high-pressure pump, ensuring correct priming and steady supply under all operating conditions. Replacing a failing transfer pump often resolves hard starts, cavitation noise, and intermittent fuel starvation - restoring reliable engine performance with a targeted, cost-effective repair.

 

 

Common applications: Cummins ISC / ISL / ISLe families and related 6.7–8.9L engines used in medium-duty trucks, buses and industrial applications. 

Cross references: Frequently listed alongside part numbers such as 2872545 / 2872545NX / 5473199 in aftermarket and kit listings - always confirm with your engine/pump serial prior to purchase.

 

 

⚙️ Reliable feed delivery: Restores correct low-pressure fuel flow to the high-pressure pump, preventing cavitation and improving start-up reliability. 

🛡 Robust construction: OEM and quality aftermarket units use hardened gears and corrosion-resistant finishes to withstand continuous service. 

⏱ Fast repair ROI: Replacing the transfer pump is significantly less expensive and quicker than replacing high-pressure pumps or whole assemblies-ideal for fleet maintenance strategies.

 

 

Part number: 4088866 (Cummins OEM) - confirm compatibility with pump/engine serial.

Function: Gear / transfer pump (low-pressure fuel feed). 

Packaging / weight (approx.): Small to medium boxed unit; listing weights vary by supplier - check vendor listing for exact packaged weight. 

Supply options: New genuine OEM units, aftermarket replacements, and fuel-pump kits (often sold with seals & hardware).

 

 

Verify fitment: Confirm engine model and pump serial before ordering - many pumps share similar shapes but differ in spline count or mounting ports.

Inspect upstream components: Replace or clean the fuel filter and suction lines to avoid recontamination of a new pump.

Check for cavitation signs: Noise, vibration, and air ingestion symptoms often indicate a failing transfer pump or blocked suction line.

Re-prime & test: After installation, prime the system and perform an engine start and idle test to verify steady fuel delivery and absence of leaks.

 

 

The 4088866 fuel transfer (gear) pump is a compact but essential component in Cummins fuel systems. Whether you choose OEM or a vetted aftermarket replacement, swapping a worn transfer pump is an efficient way to restore priming performance, eliminate cavitation noise, and maintain engine reliability for ISC/ISL/ISLe platforms. Confirm pump and engine serials with your supplier before ordering to ensure a perfect fit.

 

 

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