Fuel Injection Pump 436-1091 — Aftermarket Replacement for Caterpillar C3.3B Engine

Keep your CAT compact equipment running at peak output with this precision-built aftermarket fuel injection pump. Engineered specifically for the Caterpillar C3.3B engine, part number 436-1091 delivers consistent, high-pressure fuel metering across the full operating range — from low-idle site work to full-load digging and lifting.

Whether you’re maintaining a skid steer loader or a compact excavator, this 100% new aftermarket unit installs directly in place of the OEM pump with no modifications required.

Why This Pump?

• Precise Fuel Metering — Optimizes combustion efficiency for maximum power and fuel economy
• Consistent Power Output — Maintains stable injection pressure under demanding jobsite loads
• Direct OEM-Spec Fit — Engineered for the CAT C3.3B; bolt-on replacement with no modifications
• 100% New — Not Rebuilt — Full service life from day one, not a refurbished core
• Cost-Effective Alternative — OEM-equivalent performance without dealer pricing
• Broad Model Coverage — One pump fits multiple CAT loaders and excavators (see fitment below)

Compatible Equipment

Engine: Caterpillar C3.3B

Skid Steer & Compact Track Loaders:

• CAT 236D
• CAT 242D
• CAT 242D3
• CAT 246D
• CAT 259D

Compact Excavators:

• CAT 308
• CAT 309
• CAT 310

Part Details

• Part Number: 436-1091
• Quantity: 1 x Fuel Injection Pump
• Condition: 100% New Aftermarket

CAT equipment is built to work hard — your injection pump should match that standard. A failing pump means lost pressure, rough running, and costly jobsite downtime. This direct-fit replacement gets your machine back to work fast, without the OEM wait or the dealer markup.