CUMMINS 3991518 AFC BOOST REFERENCE HOSE (AIR FUEL CONTROL TUBE) – 5.9L 12-VALVE P7100 (1994–1998)

Product Description

The Cummins 3991518 AFC Boost Reference Hose is the genuine OEM air-fuel control tube used on 1994–1998 5.9L 12-valve Cummins engines equipped with the Bosch P7100 pump. This hose provides accurate boost pressure reference to the AFC housing, ensuring crisp throttle response, proper fueling under load, and long-term reliability.

FITMENT

• 1994–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins
• Designed specifically for Bosch P7100-equipped engines
• Direct OEM replacement for Cummins Part #3991518

CROSS-REFERENCE / ALTERNATIVE CUMMINS PARTS

Below items will be linked to actual live Cummins OEM product pages once URLs are provided:

• Cummins 3935651 AFC Housing Seal – link pending
• Cummins 3944124 Fuel Plate Bolt – link pending
• Cummins 3934988 Boost Line Fitting – link pending

WHY CHOOSE GENUINE CUMMINS 3991518?

• Perfect factory fitment and bend profile
• Maintains proper AFC boost signal for clean fueling
• Restores lost drivability caused by cracked or leaking tubes

FAQ

WHAT DOES THE AFC BOOST REFERENCE HOSE DO?

This tube transfers turbocharger boost pressure to the AFC housing, allowing the P7100 pump to fuel correctly under load.

WHAT ARE COMMON SYMPTOMS OF A BAD BOOST REFERENCE HOSE?

Poor throttle response, excessive smoke, low power, and inconsistent fueling are the most common symptoms.

IS THIS CUMMINS 3991518 HOSE A DIRECT OEM REPLACEMENT?

Yes. This is the exact OEM part number used from the factory and fits all 1994–1998 12-valve P7100 engines.

DOES THIS HOSE WORK WITH PERFORMANCE AFC MODIFICATIONS?

Yes. It is fully compatible with stock and modified AFC housings, star wheels, or full-fueling kits.

CAN A DAMAGED BOOST LINE AFFECT POWER?

Absolutely. A cracked or leaking line prevents proper boost reference, causing dramatic power loss.

Specifications for cummins 3991518