The CAT Injector 250-1306 (also referenced as 2501306) is designed for Caterpillar HEUI (Hydraulic Electronic Unit Injector) engines such as the 3508 and 3512B. In HEUI systems, high-pressure engine oil actuates the injector and the ECU precisely controls injection timing, giving very accurate fuel delivery under varying engine loads. This injector supports smooth combustion, efficient atomization, and reliable performance over long cycles — making it ideal for large transport or construction machines where consistent power and fuel economy matter.
Key Features & Insights:
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Part no: 250-1306 (also cross-referenced with 392-0212)
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Compatible with Caterpillar 3508 / 3512B HEUI engines.
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HEUI architecture ensures very good control over injection timing & quantity because of oil-actuated system + ECU.
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Helps restore smooth throttle response, reduce smoke, and recover lost performance in high-displacement Cat engines.
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Maintenance-critical: as HEUI injectors depend on clean high-pressure oil, any contamination in the oil system can drastically reduce life.
When to Replace:
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Replace when there is poor starting, engine knock, excessive smoke, or uneven cylinder firing.
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Also consider when doing a rebuild — especially if the high-pressure oil system (oil pump, rails) has had issues in the past.
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Aid maintenance by cleaning or replacing O-rings, checking the oil filter, and verifying high-pressure oil pump health when installing.
Contact for Orders:
📞 +91 78885 29020
📧 paldieselservice.chd@gmail.com
CAT 3508 FUEL INJECTOR FOR HEUI ENGINE
250-1306, 2501306
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