The Cummins ISB6.7, ISC, ISL, ISL9, and QSC8.3 are some of the most widely deployed diesel engines in North America — powering medium-duty trucks, school buses, coaches, RVs, and construction equipment. When the injection pump fails on any of these engines, you're facing hard starts, severe power loss, excessive smoke, and a vehicle or machine that can't perform. This brand-new aftermarket injection pump is a direct bolt-on replacement for part number 4088643, precision-calibrated to restore OEM fuel pressure, injection timing, and delivery volume across the entire Cummins IS/QS engine family.

✅ Direct-Fit Compatibility

• Cummins Engines: ISB6.7, ISC, ISL, ISL9, QSC8.3
• Suitable for medium-duty trucks, school buses, coaches, RVs, and construction equipment fitted with these Cummins engines
• Bolt-on replacement — no modifications required

🔧 Product Highlights

• 100% Brand New Aftermarket: Not rebuilt or refurbished — starts with a full service life
• OEM-Spec Calibration: Correct injection timing, fuel pressure, and delivery volume for the Cummins IS/QS engine family
• Direct Bolt-On Fit: No modifications required; installs like the original
• Broad Engine Family Coverage: One part number fits five Cummins engine variants — ISB6.7, ISC, ISL, ISL9, and QSC8.3
• Significant Cost Savings: Fraction of OEM dealer pricing for a new injection pump
• Protects Downstream Components: Proper fuel pressure prevents accelerated injector wear and common rail damage

📦 What's Included

• 1 × Fuel Injection Pump (4088643)

🔑 Key Specs

• Part Number: 4088643
• Condition: 100% New Aftermarket
• Fitment: Cummins ISB6.7 / ISC / ISL / ISL9 / QSC8.3 engines

Please verify your engine serial number and existing part number before ordering. Contact us for fitment confirmation if needed.