Triumph T120, T140 Bonneville Fuel Line Assembly 1971-78 1/2 PN# 83-3927 A

Restore safe, reliable fuel delivery and a clean, factory-style appearance on your oil-in-frame Bonneville with this pre-assembled fuel line assembly for Triumph T120 and T140 models, 1971–1978 1/2. Designed as a direct replacement for OEM part number 83-3927, this assembly follows the correct under-tank routing and layout for the later 650/750 twins, keeping your bike looking period-correct while improving serviceability. Supplied ready to fit with clear fuel pipe and proper metal fittings, it provides consistent feed from the fuel tap to the carburetors and helps eliminate leaks, weeping, and starvation issues associated with old, hardened hose. It is suitable for rider machines and high-quality restorations where both correctness and reliability matter.

Key Features

• Direct replacement for Triumph part number 83-3927 fuel line assembly
  
• Correct for 1971–1978 Triumph Bonneville T120 and T140 models (1/2 inch tap application)
  
• Supplied as a complete, pre-assembled unit with clear fuel pipe and metal junctions/fittings
  
• Proper layout for later oil-in-frame dual-carb fuel delivery
  
• Helps cure problems caused by cracked, shrunken, or discoloured original fuel lines
  
• Suitable for daily riders, vintage rally bikes, and show-level restorations
  

Fitment

• Triumph Bonneville T120 (selected 1971 model-year applications where 83-3927 is specified)
  
• Triumph Bonneville T140 650/750 twins, approximately 1971–1978 1/2
  
• For dual-carburetor models using OEM-style fuel line layout
  
• Replaces OEM part number: 83-3927
• Fits 1971-1978 1/2 T120R, T140V, T140 Bonnevilles. All models with the slimline tank and splay port cylinder heads (up to mid-year 1978)

The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.