1996 Geo Prizm Fuel line corrosion

Engine Mechanical problem
1996 Geo Prizm 4 cyl Front Wheel Drive Automatic 116k miles

Hi. A guy who fixed my brakes noticed the fuel line is in bad shape. He sent me the following message:

"The fuel line from the tank to the engine is literally days away from rotting out and leaking. Perhaps you've noticed a fuel odor as the lines are even damp in spots. Servicing the lines on this car might be opening a can of worms. The fuel tank is plastic (a plus as it won't rot out) The fuel sending unit (which goes in the tank) handles the routing of the fuel lines (pressure line, return line, and one or two vent lines) It also serves as the float to make your fuel gauge work. My fear is that that metal sending unit will break when trying to service the fuel line since it is also very rotten. I believe to fix the car correctly it will need the fuel sending unit, fuel filter and the pressure line run from the tank to the engine. You're probably looking at 4-6 hours of labor to do all of that work. I'll have to get back to you with a price on the sending unit."

I don't understand how he could tell that the sending unit is in danger of breaking if that part is in the tank.

I'm linking some pictures so that you can evaluate how dire the situation is and see if what he's telling me makes sense.