Product Description
The CUMMINS 3991518 AFC BOOST REFERENCE HOSE (AIR FUEL CONTROL TUBE) is designed for 1994–1998 Dodge Ram trucks equipped with the 5.9L 12-valve Cummins diesel engine and Bosch P7100 injection pump. This genuine Cummins hose provides the boost pressure signal required for proper Air Fuel Control (AFC) operation and fuel delivery management.
Use this part when replacing cracked, leaking, damaged, or deteriorated AFC boost reference tubing. Maintaining a proper boost signal to the AFC housing helps ensure correct fueling response and engine performance. Always verify fitment before ordering.
FEATURES
- Genuine Cummins OEM AFC boost reference hose
- Direct-fit replacement for factory-installed tubing
- Transfers boost pressure signal to the AFC housing
- Helps maintain proper fuel delivery response
- Designed for long service life and durability
- Ideal for maintenance, repair, or restoration projects
FITMENT
- 1994–1998 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1994–1998 Dodge Ram 3500 5.9L Cummins 12-Valve
- Bosch P7100 injection pump applications
WHAT'S INCLUDED
- 1 Cummins 3991518 AFC Boost Reference Hose
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3991518
- P7100 AFC Housing Components
- P7100 Fuel Control Components
- Cummins Fuel System Service Parts
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3991518
- Part Type: AFC Boost Reference Hose / Air Fuel Control Tube
- Engine Compatibility: 5.9L Cummins 12-Valve
- Injection Pump Compatibility: Bosch P7100
- Fitment Years: 1994–1998
- Vehicle Application: Dodge Ram 2500 / 3500
- Condition: New OEM Cummins
- Function: AFC Boost Signal Transfer
- Installation Type: Direct Replacement
FAQ
Will this part fit my truck?
This hose fits many 1994–1998 Dodge Ram 2500 and 3500 trucks equipped with the 5.9L 12-valve Cummins engine and Bosch P7100 injection pump. Verify fitment before ordering.
What does the AFC boost reference hose do?
This hose transfers boost pressure from the intake system to the AFC housing on the P7100 injection pump, allowing fuel delivery to respond properly to engine boost levels.
What are the symptoms of a damaged AFC hose?
Common symptoms include reduced fueling response, poor performance under load, boost leaks, excessive smoke, or inconsistent throttle response.
Is this a genuine Cummins part?
Yes. Cummins 3991518 is a genuine OEM Cummins replacement component.
Can a cracked AFC hose affect performance?
Yes. A leaking or damaged hose can prevent the AFC system from receiving an accurate boost signal, which may affect fuel delivery and overall engine performance.
Do I need any related parts?
Inspect the AFC housing fittings, intake boost connections, clamps, fuel system components, and surrounding hoses during installation and replace worn parts as necessary.
