Fiero fuel lines are now almost 40 years old and should be changed. I always upgraded the fuel lines to steel braided hose on on the work I have done. On the feed line I started at the gas filter w an AN male fitting and on the return a flared line to male AN fitting was used. You might want to download and look at the Russell catalog as they have everything.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "