We have a concrete porch on the back of our house, with an outdoor faucet attached. The pipe for that faucet runs under the porch, which has a concrete floor, to our basement. The pipe split this winter. Without thinking things through, we pulled the original copper pipe out, about 18' long. Now I need to feed a new very long pipe through a very small hole, across a long void that I do not have access to, and meet another small whole in the foundation of the house. Any suggestions?

That is the kind of thing that we may have to try several things until something works, and without seeing it I am not sure what to tell you to try first, other than shove a piece of 1/2" copper into the opening and see if it follows the old hole.

I love fishing.

Get an electrician's snake, no less than 50', and push as much as reasonable into the crawl space from Hole #1. Your objective is to get a loop or two or three or four in there midair that can be grabbed from Hole #2.

Get an unbent coat hanger or similar (5' long spring steel wire from an old sofa bed would be ideal). Bend one end into a "J". If you have spring steel you may need to heat it with a torch before bending. It is also helpful to bend a 90-degree angle on the other end so you know the orientation of the j-hook when you can't see the j-hook. This is your pickup tool.

Push the pickup tool into Hole #2, J-end first, and swing it around until you contact the snake. Rotate the pickup tool 360 degrees as you withdraw it from the hole, to catch the snake. This may take a few tries.

Pull the pickup tool as far out of Hole #2 as reasonable. You want to pull the snake so it is visible inside Hole #2. You just don't want to lose contact with the snake.

Reel in the snake very slowly until the end is visible inside Hole #2, or catches on the pickup tool. Pull that end through Hole #2. This will take patience and the smaller the hole, the harder it is to do.

Once you have the end of the snake through Hole #2, secure it so you don't lose it. Reel out some slack and thread it through your new pipe, then re-secure it on the far end of the pipe.

Now pull the snake taut and slide the pipe through the holes.

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Links to the State of Wisconsin Plumbing Code:
[docs.legis.wisconsin.gov]
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I am not a plumber.
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Edited 3 times.