Something some people don't realize about the factory k16 is how efficient it is at self regulated the system, and keeping volume balanced between both sides. Even if the cp3 goes full tilt, the k16 will balance and bleed off excess fuel to prevent an excess rail pressure situation. Now if your factory pump were to be defective and having PCV/VCV issues, yes, you could run into issues. 99% of the vehicles we install these on gets a new k16 because I preach preventative maintenance to my customers, and that it's a lot cheaper to do right the first time
Jared
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I didn't realize the K16 actually bleeds off fuel. Now that makes sense to me as to why Haller could get away with running a CP3 full fuel all the time.