Exergy 03-07 Dodge Cummins 5.9L 10mm Stroker CP3 Pump (6.7C Based)

Running a 2003-2007 Dodge Ram 2500 or 3500 with the 5.9L common-rail Cummins and losing rail pressure since the injector upgrade? The Exergy 10mm Stroker CP3, part number E04 20006, is the entry stroker in Exergy's 5.9 lineup. Exergy rates it for builds up to 800+HP on one pump, which covers most street and towing trucks with moderately larger injectors.

How the 10mm stroker works on a 5.9 common rail

Every common-rail 5.9 relies on its CP3 to build rail pressure for six injectors. The factory pump has a fixed plunger stroke, so once injectors flow more than it can deliver, rail pressure sags under load. The 10mm stroker lengthens that stroke for more fuel per revolution while keeping Exergy's Sportsman reliability upgrades.

The pump body is 6.7-based, not a reworked 5.9 pump. That matters during install: the inlet port sits in a different place than on your factory pump. Exergy tests every unit up to 4500 RPM and 29,000 psi, and each pump series passed a 40-hour run at 4500 RPM during development.

Symptoms this pump addresses

• Rail pressure that will not reach commanded on hard acceleration after an injector upgrade
• P0087 fuel rail pressure too low with a lift pump that tests healthy
• Smoke and lost power late in a pull as rail pressure falls away
• A worn factory CP3 you are replacing anyway and want more headroom from

How to confirm the CP3 is the limit

Log lift pump pressure next to rail pressure. If supply pressure is dropping too, fix the feed side first. Check the rail relief valve for leak-back and the injectors for excessive return, both of which bleed off pressure the pump makes. With a bigger pump the 47RE or 48RE automatic behind most of these trucks takes more torque, and a converter that slips can feel like a fuel issue. Our 48RE Cummins problems guide covers what fails first.

Fitment

E04 20006 is sold for 2003-2007 Dodge Ram 2500 and 3500 with the 5.9L Cummins, early 2003-2004 and late 2004.5-2007 trucks. Exergy also shows 2007 6.7 entries on its chart, but this page covers the 5.9 named in the title. Exergy lists it as a replacement for Bosch 0 986 437 304, 0 445 020 147, 0 445 020 039 and 0 445 020 011, and Mopar R5143425AA, 50104877AA and R5191780AD. Compare your pump tag, or send us the year and VIN. More diesel fuel parts are in engine performance.

Install notes

• Because the inlet port moves, the fuel supply line must be modified to reach it.
• Exergy requires a lift pump capable of 150 GPH at 15 psi per pump for full output. On 2004.5-2007 trucks the AirDog FP-150 for 24-valve Cummins meets that.
• Inspect the high-pressure side while it is apart. The Exergy 5.9 feed tube set and the BD 5.9 injector line kit are common replacements.
• New fuel filters, a full prime and a leak check come before first start.

No core charge applies. If your goals are past 800HP, look at the 14mm Race Series CP3 instead, and plan for the transmission with our 48RE towing upgrades guide.

Does the 10mm stroker bolt in with my factory supply line?

No. It is a 6.7-based CP3 and the inlet port is in a different location, so the fuel supply line has to be modified to reach it.

What power level is the 10mm stroker meant for?

Exergy recommends it for applications up to 800+HP. Bigger builds usually step up to the 12mm or 14mm pumps.

Will it work on my 2003 early 5.9?

Yes. Exergy lists 2003-2007 Ram 2500 and 3500 5.9 trucks and places it in both its early 5.9 and late 5.9 CP3 categories.

What lift pump flow does it need?

Exergy specifies 150 GPH at 15 psi per pump for maximum performance.

Is there a core to return?

No. Exergy states there is no core charge and no core return needed.

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