Product Description
Restore factory fueling and driveability on your 1994–2000 GM 6.5L Turbo Diesel with the INDUSTRIAL INJECTION DS4831-5521SE remanufactured DS4-5521 injection pump. Professionally rebuilt, calibrated, and ready to install for reliable cold starts, smooth idle, and correct fueling under load.
Fitment
- 1994–2000 Chevrolet & GMC 2500/3500 pickups, SUVs (6.5L Turbo Diesel)
- 1994–2000 applications using DS4-5521 family pumps
What’s Included
- Remanufactured DS electronic rotary injection pump (DS4831-5521SE)
- Pre-calibrated to OE spec; ready for installation
Recommended Parts (CPP Internal Links)
- PMD (FSD) & Harness Kit — 1994–2002 GM 6.5L
- PMD Extension Cable — 40" (Grey PMD)
- PMD Extension Cable — 72" (Grey PMD)
- PMD Resistor — 1994–2000 GM 6.5L
Cross-Reference / Alternatives
- Industrial Injection DS4831-5068SE — 1994 (verify tag DS4831-5068)
- Dorman 502-550 Reman Injection Pump — 1994–2000 GM 6.5L
Helpful Notes
- 1994 model year: verify your pump tag. If the tag is DS4831-5068, use the 5068-spec reman (see Cross-Reference above).
- Relocate the PMD/FSD off the pump and into cool airflow for best reliability (see Recommended Parts).
- Clear any stored DTCs and perform TDC offset learn after installation.
FAQ
Is this compatible with my 1994 truck?Many 1994 trucks use DS4-5521, but some use DS4831-5068. Check your pump tag; if it’s 5068, use the DS4831-5068SE unit linked above.
Do I need a new PMD/FSD?PMDs commonly fail from heat. We strongly recommend a fresh PMD, harness, and relocation with an extension cable.
Will this work on a 6.6L Duramax?No. This DS4 pump is for the earlier GM 6.5L engines. Duramax (6.6L) began in 2001 and uses a different common-rail system.
Do I need programming after install?Yes—complete TDC offset learn and clear codes. Follow factory service procedures for best results.