STALLING PROBLEMS? There are two main causes for stalling on the GM 6.5 diesel. The optical sensor is internal to the pump, but the PMD Driver (also know as FSD) can be replaced without removing your GM 6.5 diesel injection pump. Review this list of items to check before replacing your 6.5L PMD.
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1095.95
$250 Core Charge
DS Pump with New HD PMD (read about the HD PMD here). This pump is built to OEM standards, and, in fact, is the very same pump you would purchase if you paid up to twice as much at the dealer. Don't settle for a low-quality rebuild when you can have the assurance of a high quality remanufactured unit from an OEM supplier. Covered by our 1 year warranty. This pump can also be purchased without the PMD ($945) if you have recently purchased a PMD and now have injection pump issues.
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SPECIAL OFFER:
Add an FSD Heat Sync to your GM 6.5 diesel injection pump order for only $90.
Note: If you have a 1994 truck built before January 15, 1994, we need to know the part number of your old pump in order to issue a correct replacement. This is very important. The Part number is located on the top line of the ID tag on the rear of the pump. If your part number is 5068, please be sure to select correct diesel injector pump at checkout.
Note: After installing the 6.5L Injection Pump with HD PMD Upgrade, it is necessary to set the injection pump timing. Our injection pump timing tool will greatly facilitate this process - see related items below.
These pumps replace the following part numbers (and others):
DS4831-5521S, 17800077, 12561307, 12561405, 12558156, 17800114, DS831-5521, DS4831-5067, DS4831-5288, DS4831-5459, DS4831-5942, 19208317, 19208315, 1022593
6.5l Injection Pump With HD PDM Upgrade Installation Steps and Required Tools
Replacing a lift pump on a GM 6.5L diesel is a straightforward job for most experienced DIY owners and independent mechanics, but having the right tools and sequence matters. Before beginning, gather basic hand tools, a fuel‑rated line wrench, catch pan, and a low‑pressure gauge if you plan to verify output after installation. Disconnect the negative battery cable, then safely depressurize the fuel system.
Remove the old pump by loosening the inlet and outlet fittings, then unbolt the mounting bracket. Inspect the fuel lines for cracking or debris before installing the new unit. Once the replacement pump is mounted, tighten all fittings evenly to avoid air intrusion. Prime the system by cycling the key or using a manual priming method, depending on your setup. After installation, check for leaks and confirm stable pressure. This step is especially important if the truck is equipped with a 6.5l injection pump with HD PMD upgrade, since consistent lift‑pump pressure helps protect the injection pump from premature wear.
Additional Notes
Many customers purchasing diesel parts and accessories also benefit from checking fuel filter condition and verifying that the tank sock isn’t restricted. A weak lift pump often masks deeper fuel‑delivery issues so a quick system inspection can prevent repeat failures.
If you need reliable components backed by expert guidance, Accurate Technical Services LLC offers high‑quality lift pumps and supporting tools for GM 6.5L platforms. Order today for fast shipping and trusted diesel expertise.
FAQs
- Do I need to prime the fuel system after installing a lift pump?
Yes. Priming removes trapped air and ensures the injection pump receives a consistent fuel supply.
- What tools make lift pump replacement easier?
A fuel‑rated line wrench, basic sockets, and a low‑pressure gauge help verify proper installation.
- Can a weak lift pump damage the injection pump?
Low pressure can cause hard starts and strain the injection pump over time.
- How do I confirm this lift pump fits my truck?
Match part numbers, check engine VIN codes, and verify compatibility with your fuel‑delivery setup.