I've used the OEM fuel lines on all of my 8/9** tractors without issues.
If you have OEM lines that have not been modified, you can R & R the line and/or valve without removing the sheet metal, tank or rocker arm cover.
You will need the proper tools and it helps if your hands are not too large.
Yes, you will struggle the first time but it will be easier next time.
I've changed fuel valves so many times that I spend more time R & Ring the gasoline than R & Ring the valve.
All bets are off if fuel lines and/or valves have been modified.