
Image is for illustration purposes only. Actual part may vary.
3970656
This is a Cummins fuel supply tube (sometimes labeled fuel transfer tube) designed for ISC and ISL series diesel engines. It routes filtered fuel from the fuel filter housing to the high-pressure injection pump. Over time the line can crack, corrode, or develop leaks, requiring replacement. This part was commonly installed on engines built around 2008-2009.
These engines were used in various medium-duty trucks and equipment. Note: the same part number 3970656 also appears in GM parts catalogs as an engine block assembly (replaced by 470117), which is not interchangeable with this fuel line.
Part Number: 3970656
FUEL LINE
Vendor: MHC Kenworth
Dealer: Knox Trailers
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