The CP4 high-pressure fuel pump in 2011 to current Ford Super Duty diesel trucks has a well-earned reputation for failing without warning, creating sudden power loss, and taking out the expensive high-pressure fuel system in the process, costing well over $10K in repairs.
The pump failure is mainly caused by air infiltration and improper fuel filter installation, and improper priming of the fuel system before starting, leading to aerated fuel, which causes the piston assemblies to float and rotate, resulting in metal-to-metal contact and potential metal release toward the fuel injectors. These metal fragments from the CP4 circulate through the high pressure fuel lines and injectors, leading to the need for cleaning or replacing return lines and the fuel tank, or even as replacing the CP4 itself, along with injectors, high-pressure lines, and tank-to-pump lines. Repair costs can range from $6000 up to $10000 or more.
Here at PSP Diesel, we recommend using high-quality diesel and fuel additives, such as Hot Shot’s Secret Diesel Everyday Treatment (EDT). We also recommend servicing the fuel filters every 5000 miles inspecting the fuel filters for any material, and avoiding running the truck on low fuel levels.
Consider upgrading your factory CP4 to the S&S DCR Conversion Kit. The installation costs around $4500, but it can save you between $10000 and $15000 in repairs. With this upgrade, owners can have peace of mind knowing that their daily workhorse won’t let them down. This kit matches all 2011 to current Ford F250-F750 Super Duty diesel trucks. S&S Diesel provides (2) official instruction manuals for installment, ranging from 2011-2019, and 2020-2022.