Overview — AFC Air Pipe 3655003-20
3655003-20 is the air pipe used in the AFC (air-fuel control) circuit of Cummins diesel engines, carrying control air between the AFC housing and the injection pump or regulator. We can supply this part as well as related Cummins fuel and air control components, in stock or available on order — welcome to enquire by part number.
Parts Characteristics
The pipe is built as a reinforced hose or tube assembly sized to the original routing, with a bore matched to the control-air flow the AFC system needs. Reinforcement keeps the pipe stable under pressure pulses, and the outer cover resists oil, fuel and engine-bay heat so the line does not harden and crack prematurely. End fittings are formed to the original connection style so the pipe clips into the existing clamps without modification. Because the AFC circuit is pressure-sensitive, the pipe must hold its diameter and seal cleanly at both ends.
Applicable Models & Applications
The AFC air pipe belongs to the air-fuel control system fitted on Cummins mechanical injection engines, where the AFC unit modulates fuel delivery according to boost pressure. The part carries control air from the compressor side to the AFC diaphragm housing on engines in the B, C, L and N series that use this system. Applications include generator sets, marine engines, agricultural equipment and construction machinery powered by these families. Confirm the routing, end fittings and the AFC housing type on your engine before ordering.
Maintenance & Replacement
Inspect the AFC air pipe at every service for surface cracking, soft or swollen sections, and loose or corroded end clamps. A leaking control-air line makes the AFC system respond late, which shows up as sluggish acceleration, smoke at load pickup, or inconsistent governor behaviour. When replacing, fit the new pipe along the original routing, keep it away from hot manifolds and moving parts, and make sure both ends are fully seated before tightening the clamps. Replace the clamps if their threads are worn; an under-tightened joint leaks even with a new pipe.
Price Reference (USD)
The reference price for this AFC Air Pipe (3655003-20) is approximately USD 15 – 45 per unit depending on brand grade, quantity and shipping destination. This is a planning estimate only — confirm current pricing and availability with our sales team before ordering.
Value & Service
Control-air lines are often discontinued years before the engine leaves service, so we verify 3655003-20 against the original Cummins reference and can recommend the closest superseded number when stock has been exhausted. We keep the AFC pipe and related fuel-control parts available for worldwide dispatch by DHL, FedEx or UPS, and our team will confirm the routing and end fitting for your engine model before shipment so you do not receive the wrong line.
Racer Machinery is a dedicated construction-machinery parts supplier — send us your part number and engine model, and we will confirm fitment, price and lead time for the AFC air pipe and related Cummins fuel-control components.
