Fleece CP3 Conversion Hardware Kit (Pump-Less) | 2011-2016 LML Duramax

Fleece CP3 Conversion Hardware Kit (Pump‑Less) | 2011‑2016 LML Duramax

Replace the failure‑prone CP4 without the cost of a full fuel‑system overhaul. This hardware‑only kit supplies every OEM‑quality line, fitting, bracket, and harness you need to install a CP3 in your 2011‑2016 LML Duramax-just add the pump of your choice. You’ll gain the proven reliability and greater flow capacity of the CP3 while keeping full 50‑state emissions compliance (CARB EO D834‑1, SEMA SC‑FLC01‑0013) and avoiding expensive ECM retunes.

Key Features

• High‑flow CP3 feed & return fittings for unrestricted supply and return.
• Pre‑formed feed, return, and valley lines-no cutting or flare tools required.
• CP3 mounting adapter with dosing‑injector & fuel‑temp‑sensor provisions.
• FCA regulator extension harness-no wire splicing.
• 50‑state legal hardware; no FCA table changes needed when using a stock CP3.

Kit Contents

• CP3‑to‑rail high‑pressure fuel line
• High‑flow CP3 feed & return fittings
• Pre‑formed low‑ & high‑pressure feed/return lines, plus valley feed line
• CP3 mounting adapter & hardware
• Dosing‑injector feed line
• FCA extension harness
• Fuel‑temperature sensor mounting bracket
• Comprehensive hardware pack

Vehicle Fitment

Fits all 2011‑2016 Chevrolet Silverado & GMC Sierra 2500/3500 HD 6.6 L LML Duramax trims (WT, LT, LTZ, High Country, SLE, SLT, Denali).

Recommended Supporting Parts

• FPE‑LML‑CP3‑WP – Bosch CP3 Pump Kit (complete with pump).
• FPE‑34563 – PowerFlo In‑Tank Lift Pump (Short‑Bed) for consistent supply pressure.
• FPE‑34564 – PowerFlo In‑Tank Lift Pump (Long‑Bed) for the same 800 HP support.
• Custom EFI‑Live or HP Tuners calibration to optimize rail pressure.

Installation Notes

Plan 4‑6 hours with basic hand tools. Purge the fuel system thoroughly before start‑up. When paired with a stock CP3, no ECM fuel‑pressure table changes are required.