LML CP3 Conversion Hardware Kit (No Pump) for 2011-2016 Duramax Fleece Performance

Swap the CP4 for a CP3

Fleece's position is that the CP4 on the LML has a weaker track record for reliability and fueling than the CP3 that earlier Duramax engines used, and that a CP4 failure usually takes out the whole fuel system. This kit has the hardware to bolt an LBZ/LMM-based Bosch CP3 onto a 2011-2016 LML instead.

It's the no-pump version, so you choose the CP3 yourself. Fleece's own molded feed and return hoses, high-flow CP3 fittings and a valley feed line give it a factory-style fit and leave room for an aftermarket lift pump. With a stock CP3, no FCA regulator table changes are needed.

Who it's for

Owners of 2011-2016 Chevrolet Silverado / GMC Sierra 2500/3500 LML Duramax trucks who want to move to a CP3 and already have, or want to pick, their own pump.

Key specs (per Fleece)

What's included

• High-pressure line, CP3 to rail
• Feed and return fittings for the CP3 (high flow)
• Molded hoses for feed and return
• CP3 mounting adapter
• Dosing injector distribution block with feed and return lines
• FCA extension harness
• Low-pressure feed line
• Hardware

Fitment notes

• Fits 2011-2016 Chevrolet Silverado / GMC Sierra 2500/3500 with the 6.6L LML Duramax (per Fleece).
• Fleece also sells this conversion with a new CP3 (FPE-LML-CP3-WP) and with a 10 mm stroker CP3 (FPE-LML-CP3-10).
• California: Fleece lists CARB EO D-834-1 for this part.

Professional install available at Powertech Diesel, Idaho Falls — call 208-542-7793.