Order line: 1-877-SSD-65TD
As you stated in your add it works .pulling same trailer and tractor ,truck ran 30 deg. cooler thank you! 254,758 miles, next those marine injectors.
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From: Bruce
1994 K2500 4x4 130,000 original miles. I bought about a year ago after it had sat for 7 years to use as a farm pickup. I wanted to "use it" to haul bales, cows, ECT without burning it up and luckily stumbled across this site while searching overheating...
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From: Matthew S.
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6.5TD C/K Trucks  >  Diesel Fuel Injection  >  6.5 DS4-5521 Injection Pump 94-03

Completely Remanufactured and Upgraded. For all 6.5 C/K trucks 94-00, G/P Vans 94-03, 96-05 H1 Hummers. 

Warranted 1 year, unlimited mileage.

6.5 DS4-5521 Injection Pump 94-03

6.5 DS4-5521 Injection Pump 94-03

Model: ssd-5521 $750.00 $725.00
Note: core deposit of $175.00 is required
United States and Canada - All Deliveries to the United States and Canada will be made by UPS. You will be quoted the shipping cost and presented with delivery options at the time of checkout. See our shipping calculator for more information.
International Customers - Review Shipping Policies
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DS4-5521 6.5 Fuel Injection Pump

Beware, there are some unscrupulous rebuilders out there that sell for less. They just clean and re-gasket them and have the nerve to sell as "reman". Our reman injection pumps feature all the latest upgrades and a 12 month warranty. Buy from the name you trust with all your 6.5 needs, SSDiesel Supply. ALL our pumps are designed to run with new low sulphur fuels (ULSD)
SSDiesel offers this fully remanufactured electronic injection pump, built by experts here in the USA, not some guy on ebay in his garage. All injections pumps are fully rebuilt and upgraded. All wear parts are replaced, whether they test bad or not. Pumps are ultrasonically washed, and reassembled to O.E. specs. After assembly 100% of the pumps are calibrated with application specific test stands designed to simulate all engine conditions, and fully calibrated, so the pump is a simple drop-in for you. Fits all 1994-2000 GM 6.5 Turbo Diesels in C/K pick-ups, 94-03 G/P van (Express and Savana) and cab/chassis combinations such as school buses (except 1994 DS4-5068 sold separately). Also, all H1 Hummers 1996-2005.

99% of the time, only the PMD fails on these units. If you experience stalling, hesitation, stuttering, poor mileage, or no-start, chances are it is just the PMD failing. Please see our FSD Heat-SyncTM kit ssd-006 which will solve the chronic failure problem associated with PMD's. If you have already tried a new PMD and you are still experiencing problems, the injection pump must be replaced.

Applications: 1994+ GM 6.5L
Reference Numbers: DS4-5288, 5459, 5521, 5942, 10238969, 12552621, 12561307, 17800077, 12561405, 12558156, 17800114, 19208317, 19208315, 10225930

Pump is sold less PMD.


Injection pumps are sold on an exchange basis. Your core must be returned within 30 days.

Gaskets NOT INCLUDED and sold separately, see p/n ssd-306A.

If you have a 94 truck, you MUST check the model of your current pump. If the model is a DS4-5068, only another 5068 can replace it. Please see p/n ssd-5068 also sold by SSDiesel SupplyTM. ALL other 1994 pump models are superceeded by the 5521. 1994 was the only year the 5068 was used, and usually only on 3500 series trucks.

 I recommend our Haynes Manual ssd-330 if your first time replacing a pump for the basics. Then if you have any further questions, please contact tech support thru the website.


THIS PUMP IS SOLD LESS PMD, AS WE DO NOT RECOMMEND THE PMD BEING MOUNTED TO THE PUMP WHERE IT IS DESTINED TO FAIL. Please see our FSD Heat Sync kit p/n ssd-006 if a new PMD is needed. Also available is our "kit" version ssd-5521KIT, which includes this pump, FSD Heat Sync Kit and gasket install kit.

We sell 10-20 pumos per week so you are getting the freshest stock and latest upgrades.

Can ship in 1-2 business days

6.5 DS4-5521 Injection Pump 94-03


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