Thanks

 

This does not sound like a good project for beginners. First, you should always diagnose the car yourself before replacing any parts. Especially when the guy who told you allegedly what it needs was trying to sell the car to you.

 

What should I expect to pay for the labor?

 

If you walked into my shop and asked this question I would first want to see the car. What harness specifically? Just the harness that runs to fuel pump. Then I would figure out how much labor is involved.
Again this would be dependent on me seeing if I'm just running from the relay back to fuel pump? I can't really give you a definite answer because I don't know your car off the top of my head.

As it's been already stated this is not a good beginner project for you. But at the same time if you really want to know for a fact of how much is involved do some research on where the harness leads to by looking at a service manual and figuring out how much needs to be dismantled.

Figure around 40-80 an hour labor. And just from the relay back on my 94 civic would probably take me 2-3 hours with me taking my time.

Also have you or anyone else actually figured out what the real issue is and if it can be fixed without a brand new harness?

 

Paying someone for this kind of restoration, if you can find someone who is both qualified and willing to do it, can quickly become more than the car is worth. A project like this only makes sense on a do it yourself basis.