I didn't realize this big no no one compression fittings. I too had my line rust out. Replaced w/ 1/4" .035 Seamless Stainless and use Swagelok compression fittings (good up to 5000 psi). Spliced in and no signs of drips or issues. I'll definitely keep an eye on it.

FYI - mines diesel, but I was able to fish the old line out and out of shear luck, fish the new line back in. I tried bending my new line like the old, but finally gave up and shoved it in there.