Genuine Bosch high-pressure connector tube for Iveco, Case IH and New Holland FPT common-rail engines. Carries fuel from the rail through the head into the injector, sealing metal-to-metal at both ends. Six are required per engine.

Fitment

Iveco and Case IH / New Holland FPT common-rail applications. Cross-references Iveco 504100835 and Case 2854606.

Agricultural and industrial fitments vary by engine serial. Call (530) 668-0818 with your engine serial number before ordering and we will confirm this is the right connector for your machine.

Replaces these part numbers

Iveco 504100835 · Case 2854606

Why it has to be replaced

The sealing tip of a connector tube deforms slightly under torque and takes a permanent impression from the injector it was clamped against. Fit that tube to a new injector and the impression no longer matches, which leaves a leak path at the highest-pressure point in the fuel system. Bosch and Alliant Power both specify replacing all six every time injectors are serviced.

A tube can look perfect and still be finished. What is worn out is a shape you cannot see.

Symptoms of a failed connector tube

• Fuel in the valve cover — the most common sign
• Rising oil level and a diesel smell on the dipstick as fuel dilutes the oil
• Hard starting, particularly when hot
• A miss on one cylinder that follows the tube rather than the injector
• Raw diesel smell after a hard pull with no visible external leak

Warranty and shipping

Valley Fuel Injection has been a Bosch factory-authorized diesel service center since 1993. We ship nationwide from Woodland, California, typically within 1–2 business days. See our warranty terms and shipping policy.

Not sure which tube your engine takes? Call (530) 668-0818 with the year and application and we will confirm it.