24V Fuel Transfer Pump for Cummins QSB / QSB5.9 / 6B 5.9L Engine — 3990106 | Hyundai HL760-7

The fuel transfer pump is the unsung hero of your diesel fuel system — it draws fuel from the tank and delivers it at low pressure to the injection pump, keeping the entire system primed and ready. When it fails on a Cummins QSB-powered machine, you'll face hard starts, fuel starvation under load, and eventually a no-start condition. This brand-new 24V aftermarket transfer pump is a direct replacement for part number 3990106 and its cross-references, engineered to restore proper fuel flow to your Cummins QSB, QSB5.9, or 6B 5.9L engine. Simple to install, reliable in operation.

Why Replace Your Fuel Transfer Pump?

A weak or failed transfer pump starves the injection pump of fuel, causing hard starts, rough running, and power loss — especially under load. It can also cause the injection pump to run dry, accelerating wear on its internal components. Replacing the transfer pump promptly is a low-cost fix that protects a much more expensive injection pump and keeps your machine productive.

Compatible Cummins Engines

• Cummins QSB
• Cummins QSB5.9
• Cummins 6B 5.9L

Compatible Equipment

• Hyundai Wheel Loader HL760-7

OEM Cross-Reference Part Numbers

3990106 | 4943049 | 3938368 | 4932708 | 4935731 | 5362274

What's Included

• 1 × 24V Fuel Transfer Pump (3990106)

Key Specs

• ✅ 24V Electric Operation — Matches the electrical system of 24V construction equipment
• ✅ 100% Brand New — Not rebuilt or refurbished
• ✅ OEM-Spec Fuel Flow — Correct flow rate and pressure to keep the injection pump primed
• ✅ Direct Drop-In Fit — No modifications required; installs like the original
• ✅ 6 Cross-Reference Part Numbers — Easy identification across Cummins OEM numbering variants
• ✅ Protects Your Injection Pump — Proper fuel delivery prevents dry-running damage to downstream components

Please verify your engine serial number and existing part number before ordering. Confirm your machine runs a 24V electrical system before purchasing. Contact us for fitment confirmation if needed.