Ford's answers to the NHTSA 6.7 Investigation
There was a request for a link to Ford's answer's to the NHTSA investigation posted on a previous thread, since closed. Here is the link: Ford's NHTSA Answers to the 6.7 investigation This PDF i...
Forum Discussion
The gear pump on the backside of the CP3 is what draws the fuel from the fuel tank to the pump.
There always have been relief valves located throughout the system on the common rails. A high pressure on either in the rail or junction block, the pumps internal regulation and the injectors themselves.
I do not know how the Cp4 pump/system is working. on the CP3 setups fuel was only commanded when needed. If the ECM was commanding 23,000psi and the rail was at 23,000psi the pump would only work to maintain 23,000psi.
I did read somewhere about the CP4 needing to be timed. Could be misinformation though. The CP3 never needed timing.
There always have been relief valves located throughout the system on the common rails. A high pressure on either in the rail or junction block, the pumps internal regulation and the injectors themselves.
I do not know how the Cp4 pump/system is working. on the CP3 setups fuel was only commanded when needed. If the ECM was commanding 23,000psi and the rail was at 23,000psi the pump would only work to maintain 23,000psi.
I did read somewhere about the CP4 needing to be timed. Could be misinformation though. The CP3 never needed timing.
