Diesel CP4 – CP3 Injection Pump Upgrade Conversion LML For 2011-2016 GM 6.6L Duramax

5.00[jgm-review-rating] customer reviews/5


Secure and trusted checkout with

Upgraded Performance CP4 to CP3 Conversion Kit

This kit will allow you to upgrade your truck to the far more reliable CP3 and rid yourself of the factory CP4 pump. CP3 injection pumps are higher flowing and performance ones can support upwards of 600hp!**

It is highly recommended that you add a lift/supply pump when doing this upgrade, especially if you are also adding a performance fuel pump…DONT STARVE YOUR CP3!

The Duramax diesel from the factory is not supplied with a factory lift pump like other truck manufacturers. Upgrading your fuel system is a must in a Duramax!

This kit also allows for the removal of your factory fuel filter, further supporting the need for an upgraded fuel supply.


2011-2016 LML Duramax 6.6L

Package including:

As the picture shown

Fitment Guide:

CP3 on CP4 Diesel Injection Pumps Conversion Kit 

2011-2016 LML 6.6L Duramax V8 Turbo Diesel

2011-2016 GMC / CHEVY EXPRESS 2500 6.6L
2011-2016 GMC / CHEVY EXPRESS 3500 6.6L
2011-2016 GMC / CHEVY EXPRESS 4500 6.6L
2011-2016 GMC / CHEVY SAVANA 2500 6.6L
2011-2016 GMC / CHEVY SAVANA 3500 6.6L
2011-2016 GMC / CHEVY SAVANA 4500 6.6L
2011-2016 GMC / CHEVY SIERRA / SILVERADO 2500 HD 6.6L
2011-2016 GMC / CHEVY SIERRA / SILVERARO 3500 HD 6.6L

Orders cannot be canceled after they’ve been placed. We use multiple third party fulfillment companies, distribution centers & manufactures. The logistics of coordinating a cancellation are not feasible.

Returns are accepted for most items. Returns must be made within 30 days of receiving item. Item/s must be brand new & resell-able condition. Customer is responsible for return shipping costs. Original shipping charges are non refundable.

Electronics that require custom tuning or are VIN specific cannot be returned and are non refundable. This includes EZ Lynk, SCT, Bully Dog & EFI Live.

Contact us for return instructions. Do NOT send to return address on original package. 

Availability – If you see “#” pieces in stock above the add to cart button it will ship within 1 business day. If there’s no quantity shown; the part is either built to order, ships directly from the manufacture or is temporarily out of stock. In that case, could take up to 20 business days to ship.

Free Shipping

on all U.S.orders.Applies only to the lower 48 states.

Same-Day Shipping

order before 3 p.m.EST for guaranteed same-day shipping.

12 Month Warranty

on all products. Be sure to ask for our extended warranty!

Easy Returns

Not the right part?Return it within 30 days for a full refund.