Thanks for previous responses to the other Black hoses in question.

Now I'm looking at these 2 other tubes (hoses):

1. Lift pump to Large filter

2. Return Line Injection Pump to Filter Housing

Basically they look like hard plastic and mine are yellow. They fit over barbed brass connections at the end of each length. They may have been opaque at one time or clear. They basically looking like Fish Tank tubing; yes I know they can't be this.

They are not leaking but the car is a 1982 and I'm thinking of replacing them as a Preventative Maintenance item. Is this a good idea? Or just let them go?

They are not leaking but I would be afraid to wiggle them.

Side Note:
I had sent a message to Phil about the other Black hoses and he gave me information on these 2 by mistake.

He said these are sold as an assemblies. $20/$40 each line.

You mean the original material can not be purchased and just slid back onto the barbs?

TY