Industrial Injection 232708 AFC Spring Kit for 94-98 Cummins 12 Valve

The Industrial Injection 232708 AFC Spring Kit is designed for 1994–1998 Dodge Cummins 12-valve 5.9L diesel engines. This kit targets the Air Fuel Control (AFC) housing on the Bosch P7100 injection pump, allowing tuners and diesel enthusiasts to optimize fueling response and reduce the characteristic "black smoke" lag associated with stock AFC spring calibration.

The AFC (Air Fuel Control) device on the P-pump regulates fuel delivery based on boost pressure. Upgrading or retuning the AFC spring tension allows fuel delivery to ramp up more aggressively in relation to incoming boost, improving throttle response, reducing smoke, and supporting increased power output — especially when paired with injector or pump upgrades.

Key Features:

• Designed specifically for the Bosch P7100 injection pump found on 1994–1998 12-valve Cummins 5.9L engines
• Retuned AFC spring calibration for improved fuel curve and boost-referenced fueling
• Helps reduce excessive black smoke under acceleration
• Supports modified injection pump and injector upgrades
• Direct-fit replacement — no pump removal required for basic spring swap
• Manufactured by Industrial Injection, a trusted name in diesel performance

Whether you're building a high-performance diesel or simply cleaning up the fueling on a stock truck, the Industrial Injection AFC Spring Kit is a foundational diesel performance upgrade for any P7100-equipped Cummins.