CATEngine Parts

319-0678 Hydraulic Unit Injector Pump — Cat

This Hydraulic Unit Injector (HUI) pump is a sophisticated engine component that combines fuel injection and electronic control functions within a single unit. Manufactured to meet rigorous OEM standards, it ensures precise fuel delivery and atomization, unlike a worn pump that can cause inconsistent combustion. Operators may experience rough idling, reduced engine power, increased exhaust smoke, or difficulty starting when this HUI pump fails.

Hydraulic Unit Injector Pump – Part No 319-0678 – CAT Spare Part
Part Specifications
BrandCAT
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Inspect mating surfaces for wear before fitting. Use torque specs from service manual. Replace gaskets and seals as a set — reusing compressed gaskets causes oil leaks. Clean all oil passages with compressed air.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeHydraulic Unit Injector Pump
MaterialSteel alloy and high-performance seals
ApplicationEngine fuel injection system
Service LifeReplace as needed based on performance diagnostics
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Initial signs of a failing HUI pump include rough engine idling and a noticeable loss of power. If ignored, the engine may begin to misfire, consume more fuel, and produce excessive exhaust smoke. Prolonged use with a faulty HUI pump can lead to internal engine damage from incomplete combustion and fuel dilution.

Installation Tip

Thoroughly clean the injector bore and surrounding areas before installing the new HUI pump to prevent contamination. Ensure the electrical connector is securely seated and properly sealed to prevent moisture ingress.

Service Note

Inspect the fuel filter and water separator, and check the engine wiring harness for any signs of damage or corrosion.