Choosing the best 6.7L Power Stroke injection pump comes down to two questions: are you restoring a tired or failed pump, or feeding a build that has outgrown the factory fuel supply. The 2011 to 2019 6.7 Power Stroke, Ford's Scorpion diesel, runs the Bosch CP4.2 high-pressure pump, and it sets the ceiling on how much fuel your injectors can deliver. Pick the right replacement and the truck runs like new. Pick an upgraded pump sized to your goal and you gain the rail pressure a tuned, big-injector build needs. This guide explains how the CP4.2 works, how to match one to your truck, and our top picks so you buy once and buy correctly.
How the 6.7 Power Stroke injection pump works
The CP4.2 pulls fuel from the tank supply and pressurizes the common rail that feeds the injectors. The engine control module commands rail pressure, and the pump has to keep up. When you add larger injectors or ask for more power, the stock pump can run out of volume and rail pressure drops under load, which shows up as a loss of power up top. When the pump wears, you can see hard starting, fuel pressure codes, and rough running. The best 6.7L Power Stroke injection pump for you is the one that matches your situation, whether that is a clean stock restore or an upgrade for more fuel.
- Stock replacement: a direct-fit CP4.2 restores a worn or failed pump to factory output, ideal for a daily or tow truck.
- Improved stock CP4.2: a stronger version of the factory pump for owners who want a more robust unit in the stock location.
- Stroker CP4.2: a higher-volume 10mm stroker supplies the extra fuel a tuned, big-injector build needs.
Get the year right
The 6.7 Power Stroke changed during its run, and the injection pump application is year specific. Match your exact truck before anything else:
- 2011-2014 6.7 Power Stroke: its own stock pump application.
- 2015-2019 6.7 Power Stroke: a different stock pump application from the early trucks.
Confirm your year, then choose a stock replacement or an upgrade based on your power goal and injector size.
Our top 6.7 Power Stroke injection pump picks
These pumps cover the range from a clean stock restore to a tuned build, sorted by purpose.
Best stock replacements
To restore a tired 6.7, match the pump to your year. The 6.7 Power Stroke injection pump for 2011-2014 trucks and the injection pump for 2015-2019 trucks return factory rail pressure and reliable fueling to a daily or tow truck.
Best improved stock CP4.2
For a stronger factory-style pump, the Exergy improved stock CP4.2 for the 6.7 Power Stroke is a more robust unit that still fits the stock location, a good pick for a lightly tuned truck.
Best stroker for a build
For a tuned truck with larger injectors, the Exergy 10mm stroker CP4.2 supplies the extra volume a high-fuel 6.7 build needs to hold rail pressure.
You can compare stock and upgraded pumps in our diesel injection pump parts section.
Signs your 6.7 pump needs attention
A worn or failing pump shows itself in a few ways. Watch for hard starting or long cranking, a loss of power up top under load, rail pressure that will not hold to the commanded value, and fuel pressure codes. On a build, a stock pump that cannot hold rail pressure with larger injectors is not failing so much as out of capacity, and the fix there is a stroker rather than another stock unit. Confirm rail pressure against commanded pressure with a scan tool before buying.
Protect your CP4.2 with clean, quality fuel
Whichever pump you choose, the single best thing you can do for a 6.7 Power Stroke pump is run clean, quality fuel and keep the fuel filters fresh. The CP4.2 depends on the fuel for lubrication, so contaminated or poor fuel and stretched filter intervals are hard on it. Keep the water separator drained, change filters on schedule, and avoid running the tank to empty. Good fuel habits protect a new pump and help your injectors and rail live longer too, which makes any pump you buy a better investment.
Match the pump to the rest of the fuel system
The pump is one part of the fuel system. To use an upgraded pump you also need injectors sized for your goal, a healthy low-side supply that keeps the pump fed, and a tune written for the added fuel. A big pump with stock injectors will not reach its potential, and big injectors with a stock pump will drop rail pressure under load. Balance the two. If you are also planning injectors, our guide on the best 6.7L Power Stroke injector upgrades covers sizing so the pump and injectors match.
Frequently Asked Questions
What is the best 6.7 Power Stroke injection pump for a daily driver?
For a daily or tow truck, a direct-fit stock CP4.2 for your year is usually the best 6.7L Power Stroke injection pump choice. It restores factory rail pressure and reliable fueling without added volume a stock truck cannot use.
When do I need a stroker pump?
Step up to a 10mm stroker CP4.2 when you have added larger injectors and a tune and the stock pump can no longer hold commanded rail pressure under load. The stroker supplies the extra volume a high-fuel build needs.
Do 2011-2014 and 2015-2019 trucks use the same pump?
No. The injection pump application is year specific across the 6.7 Power Stroke run, so a 2011-2014 pump and a 2015-2019 pump are not simply interchangeable. Confirm your exact year before buying.
How do I make my pump last?
Run clean, quality fuel, keep the fuel filters fresh, drain the water separator, and do not run the tank empty. The CP4.2 relies on fuel for lubrication, so good fuel habits are the best protection for any pump you install.
Bottom line
The best 6.7L Power Stroke injection pump upgrade is the one matched to your goal and your exact year. A direct-fit stock CP4.2 restores a daily or tow truck, an improved stock CP4.2 adds robustness for a lightly tuned truck, and a 10mm stroker feeds a big-injector build. Confirm your year and injector size, verify rail pressure before you buy, run clean fuel to protect the pump, and balance it with injectors and a tune, and your 6.7 holds rail pressure and makes clean power under load.
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