wp20297 - Genuine Cummins Injection Pump 6BT 5.9L Diesel - 1 - wisentpartscenter.com

Description

Genuine Cummins Fuel Injection Pump is a Bosch in-line mechanical injection pump used on Cummins 6BT 5.9L diesel applications. The pump meters, pressurizes, and distributes fuel to the six injectors at the correct point in the engine cycle. Bosch number 9-400-030-740 / 9400030740 is documented with both Cummins 3929410 and 3936330.

Key Functions
- Meters diesel fuel according to engine speed and load.
- Pressurizes fuel for delivery to the six mechanical injectors.
- Controls injection timing and cylinder-by-cylinder fuel delivery.
- Provides mechanical fuel control for the Cummins 6BT fuel system.

Fitment & Specifications
- Engine: Cummins 6BT 5.9L Diesel
- Component Type: Mechanical Fuel Injection Pump
- Pump Design: Bosch in-line / A-type injection pump
- Cylinder Configuration: 6-cylinder
- Cummins Part Numbers: 3929410, 3936330
- Bosch Number: 9-400-030-740 / 9400030740
- Bosch Pump Family Marking: PES6A-RS2881

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

Purpose of the Part

The 3936330 is responsible for supplying each cylinder with a precisely metered quantity of high-pressure diesel fuel at the correct injection timing. Because this is a mechanical in-line pump, its calibration, governor settings, and timing are matched to the specific engine application rather than controlled by a modern common-rail system.

Issue Symptoms / When to Replace

A worn or incorrectly calibrated injection pump can cause hard starting, unstable idle, loss of power, excessive smoke, uneven cylinder fueling, or an engine that will not reach rated speed under load. Similar symptoms can also result from restricted fuel supply, weak lift-pump pressure, injector problems, incorrect injection timing, or air entering the fuel system, so those areas should be checked before condemning the pump.

Brand Information

Bosch began series production of diesel injection equipment for commercial vehicles in 1927, and its in-line injection pumps became widely used in commercial and industrial diesel engines. Bosch notes that in-line pumps dominated much of the commercial diesel market before distributor-pump technology became widespread.

Installation Notes

Injection-pump timing must be set according to the exact 6BT engine calibration and application. Keep all fuel connections clean during installation, and do not transfer timing or governor settings from another visually similar Bosch A-pump unless the complete pump and engine numbers match.

How to Identify an OEM Part

A genuine 3936330 should be identified by the Bosch factory identification data on the injection pump, including the complete Bosch number 9-400-030-740 / 9400030740. Match the full Bosch and Cummins numbers rather than relying only on the general PES6A-RS2881 pump-family designation.

Why Buy 9400030740 from Wisent Parts

  • ⏱️
    Fast shipping
    Orders before 12PM EST ship same business day.
  • 🛡️
    180-day warranty
    All parts covered from delivery date.
  • ↩️
    Easy returns
    30-day returns.
  • ✅
    Verify fitment
    Send VIN/ESN and we’ll confirm.

Shop with confidence

Warranty & Return Information
Warranty Information

Wisent Parts offers a 180-day 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.