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Cummins · Fuel System
3970656
In stock · ships from Knoxville
This is a Cummins fuel supply tube (sometimes labeled fuel transfer tube) designed for ISC and ISL series diesel engines.
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Verified fitment for 2 applications
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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 data verified against 2 catalog sources
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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.
Part Number: 3970656
FUEL LINE
Vendor: MHC Kenworth
Dealer: KP Services Crossville
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