Web Reference: After converting your CP4 to a CP3, the stainless steel 9th injector return plug with o-ring is used to block the non-utilized fuel return loop. The CP4 utilizes the additional return plumbing where the CP3 does not. This listing has all 3 components needed to eliminate the complete 9th injector assembly (second picture) on any off-road use 2011-2016 Duramax LML. This is usually done when adding a full high flow piping kit and the truck still has the CP4 pump in it. This plug is used to block the non-utilized fuel return loop specific to the CP4.2, after converting a 2012-2016 LML to a CP3. A CP3 does not support this additional return plumbing. Not sealing this portion of the return off may result in a return fuel leak, hard starting or poor performance.
YouTube Excerpt: Today we're upgrading the airflow on a 2017–2019 L5P Duramax by installing a new
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