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DS4 Electronic Injection Pump - Rebuilt, ULSD Upgraded

Quadstar Tuning LLC

  • $1,050.00

Will be in stock after

All computer operated 6.5L diesels had the DS4 injection pump starting in 1994.  If you are unsure of what model you need, please read the ID # off your existing pump or contact us before ordering.  All model numbers other than 5068 are compatible with a 5521 replacement.

What makes this pump stand out from the rest?

  • Guaranteed NEW main fuel solenoid (FSOL).  This is the main electronic fuel control component which is driven by the PMD.
  • Complete genuine Stanadyne ULSD upgrade kit installed (see below)
  • Stanadyne authorized rebuild quality, no substitutes.

We only use the best components available including the genuine Stanadyne ULSD upgrade kits ($175 value). The "S" at the END of the model number indicates a pump has been updated (5521S, 5068S, etc).  An "S" before the model number does not mean a pump has this update.  When comparing our pumps to others, keep this in mind because the term "upgraded" can be deceiving!

The following image shows the upgraded ULSD fuel solenoid control parts (bottom) vs OEM parts.  The low-friction coating and design changes stand out.


These particular pumps are rebuilt and tested by a certified Stanadyne tech, in the USA, using ISO calibrated equipment. They are electronically flow tested with the correct PMD calibration resistor (included) to ensure they'll perform on your vehicle and drop-in without issue.

These do NOT come with a PMD, but they do include a brand new PMD harness(attached to pump).  Suitable core return is required with all re-manufactured pump orders, and a pre-paid return shipping label is included in the price.


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