Brake lines
 

I have a rear driver side brake than that has rusted out and it spewing break fluid, I was curious if anyone has the diagram for the break lines? It looks like the line I'm needing to replace goes around the gas tank and I was hopping i wouldn't have to drop the tank.

2005 saturn l300

Get a roll of the correct size, probably 3/16, and run it your way.
Here's the manual.
https://charm.li/Saturn/2003/L300%20V6-3.0L%20VIN%20R/

Might want to consider that the other lines in the system are potentially in about the same condition, given the age of the car

I highly recommend getting the copper-nickel version of brake line.
Costs a little more, but so much easier to work with.

how would you keep the master cylinder from running dry if the repair needed to be done over several days?