FUEL SYSTEM & RELIABILITY
A preventive pump replacement for owners planning ahead, or part of the repair plan after a confirmed failure. Here’s what the S&S conversion changes, so you can decide what your truck needs.
THE BASICS
The frame-mounted lift pump feeds the engine; the high-pressure pump builds the pressure the rails and injectors need. A supply fault and a pump fault need different repairs, and filter and water-separator service protect both. Ford diesel supplement ↗
Internal failure can spread metal through the fuel system. Repair scope depends on where the debris traveled: injectors, rails, lines and even the tank may need attention. S&S repair overview ↗
It replaces the CP4 with a two-piston DCR pump developed for the 6.7L by S&S and PurePower, with an eccentric drive and pressure-lubricated cam and bushings. Stanadyne ↗
S&S describes factory-style operation without calibration changes; the pump alone leaves power at the factory level. The reason to do it is replacing the CP4 design. S&S overview ↗ FAQ ↗
YOUR SITUATION
Consider a preventive conversion if downtime would hurt your work or travel and you plan to keep the truck. We review the year, service history and fuel-system condition first, and check open recalls and any coverage before pricing the work.
Plan a preventive conversionStart with diagnosis. Low cranking rail pressure can come from lift-pump supply, excess return flow, the pump or a sensor. Symptoms alone can’t name the failed part. S&S diagnostic FAQ ↗
If metal is found, the plan must include the contaminated fuel circuit, cleaned or replaced before a DCR goes in. S&S post-failure guidance ↗
Truck down? Call 520-990-1033OPTIONS
| Stock CP4 | Disaster prevention kit | S&S DCR conversion | |
|---|---|---|---|
| High-pressure pump | Original CP4 | Keeps the CP4 | Replaced with DCR pump |
| If the pump fails | Debris can reach injectors, rails and tank | Helps contain debris by rerouting fuel | CP4 failure mode removed |
| Power | Factory | Factory | Factory (no calibration change) |
| Relative cost | — | Lower | Higher |
| Best for | Low-mileage trucks with clean history | Tighter budgets; trucks you may not keep long | Trucks you plan to keep and work hard |
Comparison summarized from S&S: DPK vs DCR ↗. We help you weigh pump condition, budget and downtime.
QUESTIONS
Recall 24S78 / NHTSA 24V-957 covers certain 2020–2022 Super Duty and 2021–2022 F-650/F-750 trucks. Ford found biodiesel deposits on pump parts that could cause failure and loss of drive power; the remedy is a free dealer PCM software update. Check your VIN before paying for a conversion. NHTSA notice ↗ Check your Ford VIN ↗
S&S currently lists the Ford DCR application through model year 2026. We confirm the exact kit and current emissions approval for your truck before ordering. Current application ↗
S&S publishes a two-year, unlimited-mile product warranty, subject to its terms. It excludes damage from outside contaminants and costs such as installation labor and travel. We review coverage with your quote. Warranty terms ↗
Keep up with the truck’s fuel filter and water-separator schedule. Clean, dry fuel is still the best protection for any injection system. Ford maintenance guidance ↗
The 2011–2016 LML Duramax uses a CP4 too. Ask about protection options for it; see our Duramax field guide and Duramax bulletproofing.
PLAN IT
Model year, mileage, symptoms and any past fuel-system work. We confirm site access, then send a parts-and-labor estimate. Labor is $149–$298/hour by truck class (see rates).
READY WHEN YOU ARE
Tell us your year and mileage. We’ll check recalls and recommend the right option.
