I'm replacing my injectors and on pelican auto parts it says to replace the line between the pump and the rail. Is that absolutely necessary or can I get away with leaving in the original?

 

Replacement's recommended in most of the repair manuals, however, with lotsa TLC (no added twists / bends, and no damage to either flange on each end), it can be reused. Mines been apart 2 - 3 times without replacement.

 

I've removed the fuel rail many times and put it right back in without any issues. Reuse it until you can confirm a leak, don't waste money buying the new part, yet.