If you run a 2011 and newer 6.7 Power Stroke, you already know the CP4.2 injection pump is the weak link. When it fails, it grenades internally and sends metal through the entire fuel system. Injectors, lines, rails, the works. It is one of the most expensive failures on the truck, and it can happen with no warning.
There are two ways to deal with it, and they are not the same thing. Know which one you actually want.
Bypass Kit vs Pump Conversion
| Option | What it does | Best for |
|---|---|---|
| Disaster prevention bypass | Keeps the CP4 but reroutes the return so a failure does not push debris through the whole system | Limiting damage and cost if the CP4 lets go |
| Pump conversion | Removes the CP4 entirely and replaces it with a pump built for this fuel | Taking the failure point off the truck for good |
A CP4.2 Disaster Prevention Bypass Kit is the smart minimum. It will not stop a CP4 from failing, but it keeps that failure from turning into a full fuel system replacement. We break down exactly how that works in our CP4 disaster prevention writeup.
The Permanent Fix: Convert the Pump
If you want the problem gone instead of managed, the answer is a conversion. The S&S CP4 to DCR Pump Conversion pulls the CP4.2 off the truck completely and replaces it with a pump designed to live in our fuel. No more CP4 hanging over your head, no more wondering if today is the day. It is more up front than a bypass, and it is the last time you think about your injection pump.
Which One Is Right
If the truck is mostly stock and you want cheap insurance, run the bypass. If you tow for a living, you have already added power, or you just do not want the CP4 on the truck anymore, do the conversion and be done with it.