How do you fix wiring for 1988 ford ranger4x4 wiring to the fuel pump

Are you wanting to wire voltage or ground circuits? Remember, you have to deal with the fuel gage sending unit circuit or the fuel gage won't work.
The basics, if single wire dedicated circuit, leave a pigtail wire, both ends, as long as the problem is between the pig-tails, run a new wire, splice into pig-tails. The new wire can lay anywhere till you do some testing to see if it's going to work.
I short-handed this post a little. I wasn't sure exactly what you have going on?
Do want a wiring diagram?