Forum Discussion
drittal
Apr 05, 2016Explorer
4x4ord wrote:
Here is a Link to a page that describes some of the engine upgrades. The injection pump has been addressed. Somewhere I've read that the new pump has a longer stroke.
Unless Bosch found a way to keep the insides of the 4.2 pump inside it, all they have done is made it more resistant to wear. In the end, all HPFP will eventually fail. The question remains when. The difference is a CP3 keeps it's insides inside. You replace the pump and go on with life. A CP4 eventually disintegrates and pushes all that metal through the fuel system before you ever know there is a problem. End up replacing the entire fuel system.
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