Industrial Injection DS-5521SE Remanufactured DS4 6.5L Diesel Injection Pump

The Industrial Injection DS4831-5521SE is a professionally remanufactured Stanadyne DS4 electronic rotary fuel injection pump designed for 1994–1999 GM 6.5L turbo diesel pickup trucks. Built to OE calibration specifications, this pump restores factory fueling performance, smooth idle, reliable cold starts, and correct fuel delivery under load.

Industrial Injection is a leading remanufacturer of diesel fuel systems, and each pump undergoes a thorough rebuilding process. Components are completely disassembled, cleaned, inspected, and reassembled to OEM specifications. Worn or damaged parts are replaced to ensure long-term reliability and consistent performance.

Key Features:

• Remanufactured Stanadyne DS4 electronic rotary injection pump
• Rebuilt and calibrated to OE specifications
• Restores factory fueling, driveability, idle quality, and cold-start performance
• Direct replacement for DS4-5521 family pumps
• OEM cross-reference: DS4831-5521SE / DS4-5521

Important Installation Notes:

• 1994 model year pump tag verification required: Some 1994 trucks were equipped with a DS4831-5068 pump — if your pump tag reads DS4831-5068, this unit is not compatible; the DS4831-5068SE is the correct replacement
• PMD/FSD relocation off the pump body and into cooler airflow is strongly recommended for improved reliability, as heat is the primary cause of PMD failure
• After installation, bleed the fuel system, clear any stored DTCs, and perform a TDC offset learn procedure as required by the GM service manual

Engineered by one of the most trusted names in diesel performance, the Industrial Injection DS4831-5521SE delivers dependable, factory-correct fueling to get your 6.5L diesel back on the road with confidence.