This article will mainly interest RAM 6.6 owners but it does mention the CP4 bypass for Ford 6.7 owners at the end. It is about swapping the CP4 for a CP3 as a precautionary measure
Two issues with the CP4 pump. Bad design - may be fixed with new ones - and Ford not honoring their warranties. GM VW and BMW cared enough about their customers to cover the bad pumps. Ford - not so much.