Fleece Performance 06-10 GM Duramax LBZ/LMM CP3 Injection Pump
The CP3 on a 2006-2010 Duramax has a reputation as the tough one, but after 200,000 miles, a tank of bad fuel or a lift pump that let it run starved, even a CP3 wears out. If your LBZ or LMM Silverado or Sierra 2500/3500 is cranking long, setting low rail pressure codes or falling flat when you pull a trailer up a grade, the Fleece FPE-DMAX-CP3 is a brand-new Bosch CP3 that drops in where the stock pump came out.
The CP3 is a gear-driven radial piston pump on the front of the engine. It takes low pressure fuel from the supply side, meters it through the inlet valve (often called the FCA or MPROP) under ECM control, and pushes it to the rails at injection pressure. The rails feed eight injectors, and a pressure sensor on the rail tells the ECM whether actual pressure matches what it asked for. When the pump loses efficiency, the ECM opens the metering valve further to compensate, and once it runs out of room, rail pressure falls behind and the codes start.
This is not a modified or stroker pump. Fleece sells it as a new Bosch CP3, the stock-style replacement, with a new snout O-ring included. If you want more flow for a tuned truck, Fleece also offers the CP3K and PowerFlo 750 pumps, but those are separate products.
A scan tool that shows desired and actual rail pressure plus metering valve command is the best test. If actual pressure trails desired while the valve is already commanded wide open, the pump is the likely culprit. Before blaming it, check supply pressure, change both filters and rule out a stuck LBZ/LMM inlet metering valve, which is a cheaper fix. A pressure relief valve that leaks back to the tank can also pull rail pressure down. Tow-heavy trucks with a slip or flare under load should also get a look at the Allison six-speed; our Allison 1000 converter shudder guide helps separate a fuel problem from a driveline one.
This listing is for 2006-2007 LBZ and 2007.5-2010 LMM 6.6L Duramax trucks, Silverado and Sierra 2500/3500. Fleece also lists it for earlier LB7 and LLY trucks, but on 2001-2005 engines the fuel pressure regulator has to be scaled in the tune, so it is not plug-and-play there. On a 2011-2016 LML it only applies as part of a CP3 conversion. Interchange numbers on Fleece's page include Bosch 0 445 020 105 and 0 986 437 332 and GM 97780091 and 97780161; match yours or send us your year and VIN. More parts for these trucks are on our Allison 1000 Duramax page.
| Brand | Fleece Performance |
| Part number | FPE-DMAX-CP3 |
| Fits | Fleece Performance 06-10 GM Duramax LBZ/LMM CP3 Injection Pump |
| Type | Injection Pumps & Controllers |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
No. It is a new Bosch CP3 sold as a stock-style drop-in replacement. Fleece's CP3K and PowerFlo 750 are the higher-flow options.
Fleece lists those years, but the fuel pressure regulator must be scaled in the tune on 2001-2005 trucks. On a 2006-2010 LBZ or LMM it drops in without that change.
No. There is no core charge and you do not need to send your old pump back.
Install new fuel filters and the included snout O-ring. If supply pressure was low, add a lift pump. If the metering valve is original and suspect, replacing it at the same time saves a second job.
Fleece covers this pump with a 1 year limited parts warranty.
