Hey guys, came here for some possible help.

Coyote swap (gen 1 truck engine) into a 97 Mustang. At first, had problems with running out of fuel at 3k rpms. Did a 255lph pump (should be more than enough?) And I thought I fixed it, but now I'm just cutting out at 4k instead.

Would a fuel filter made for the 200hp 4.6 restrict flow for a 400hp 5.0? Are stock lines too small or what?
Any ideas are appreciated!

And keep your "why not buy a new car" bull**** to yourselves, this was a passion project with a budget and I'm just working out these last few kinks.

 

Your lines should be good for over 400hp pretty easily, you might want to try running higher gauge wire to your fuel pump. I've had issues with that on my engine, 10ga wire through a relay should do the trick, might want to change your fuel filter as well just in case.