1+ Fuel filler cap  
2+ Clamp ring  
3+ Grommet  
4+ Flanged head screw  
5+ Fuel filler pipe  
6+ Support bracket  
7+ Shakeproof washer  
8+ Nut  

The part numbers in the assembly image below relate to the product number in the table. Clicking on the part number will open up the relevant part details.