CP3/CP4 Testing Service

We offer high-pressure common rail pump testing for CP3 and CP4 units. This is a critical step if you’re replacing injectors or chasing fuel system issues.

A failing or worn pump can often be the root cause of injector failure. Our service evaluates pump performance across a range of operating conditions – from cranking speed to wide open throttle. We inspect and calibrate key components including:

• Cascade valve
• Supply pump (checked for internal wear)
• FCA / Mprop regulator (flow control and reaction)

For CP3 pumps, we also offer an optional flow optimization service during testing. If your pump and components are in good shape, we can safely increase output beyond stock specs for as low as an additional $199.99.

• Stock CP3 flow: 175–200 LPH
• Optimized output: 225+ LPH

This upgrade results in quicker acceleration, better throttle response, and potential MPG gains. Some customers report up to +2 MPG, reduced smoke, and lower EGTs.

Our modifications match the performance of our popular Arson 3 CP3 Upgrade Kit – but at a much lower cost, using your existing pump. You’ll receive full test data showing the before-and-after flow rates.

This is a highly recommended upgrade for towing, higher-performance tuning, or supporting up to 45% oversize injectors.

We’ve sold thousands of Arson kits since 2007. Just search the name and see what customers have to say.