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Any 15-liter ISX15, QSX15, or X15 engine needs the Cummins Fuel Supply Tube routed and sized specifically for that engine family's fuel system layout, not a generic supply line. Rigid tube construction holds its shape and routing through the engine bay, avoiding the sag or chafing risk a flexible hose can develop over the same span. The Cummins 5575372 matches the exact bend geometry and fitting ends those three engine applications share, so it installs into the factory routing without modification. Correct tube geometry keeps the fuel supply line clear of hot components and moving parts throughout the engine bay.
TUBE,FUEL SUPPLY
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