My father had a Cub Cadet that had the same symptoms you are describing. The previous owner also replaced the fuel lines as yours was replaced. When the previous owner replaced the fuel lines, they were mis-routed in a couple of spots. One of the places where the fuel line was mis-routed caused the fuel line to be pinched shut as it was caught between the frame and the floor pan. This mainly happened when my dad was on the tractor causing his weight to make the pan pinch the fuel line.
Hopefully this helps as another place to look.
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1989 - Cub Cadet 1772
1987 - Cub Cadet 1572 w/Rear PTO & Cat. 0
38" Lawn Sweeper #196483
42" L42 (Bush Hog) Rotary Cutter # 190349
45" 2-Stage Snowblower # 196364
48" Haban Rotortiller Rear PTO Driven #190356
54" SnowBlade with hydraulic Angle #196376
60" Haban Mowing Deck #196374
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