Cummins ISB / QSB Injector Connector Tube | Genuine Bosch F00RJ01620

Genuine Bosch high-pressure connector tube for Cummins ISBe and QSB industrial and off-highway engines. Carries fuel from the rail through the head into the injector, sealing metal-to-metal at both ends. One is required per injector.

Fitment

• Cummins ISBe 4-cylinder 3.9L and 6-cylinder 5.9L
• Cummins QSB4.5, QSB5.9 and QSB6.7
• DAF CF65, LF45 and LF55

Serves the CRIN1 injector family, including Bosch 0445120231 / 0986435597. This is a different part from the Ram truck connectors. If you are working on a Dodge or Ram pickup, you need F00RJ01572 (5.9L) or F00RC00647 (6.7L).

Replaces these part numbers

Cummins 3975703 · DAF 1876292

Match the number on your old tube, or call 530-668-0818 with the year and engine and we will confirm it before you order.

What the connector tube does

The connector tube sits in the cylinder head and feeds the injector. Follow the service manual for your engine on when it has to be replaced.

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 is a Bosch Authorized service center and has been in business since 1993. We ship nationwide from Woodland, California. 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.

Part Numbers & Cross Reference