It looks like the Fuel Pressure Regulator line. The FPR is located forward of the end of that line (obviously), towards the thermostat housing/top radiator hose. It will be along the fuel rail towards the front. I hope this helps.
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1994 Ford Ranger XLT Extended Cab
2WD Automatic
4.0 V6 OHV
MODS: LED Dashlights, Wired for OHC (don't have the guts to cut the headliner), Lighted Visors, Auto-Dim/Mirror, Auto Headlights, other than that it's pretty much stock
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